Brief Profile

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Please be aware that the REACH registration parts of this Brief Profile are no longer maintained; they remain frozen as of 19th May 2023. All other data parts (substance identity, C&L, key regulatory lists etc. are up to date).

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Brief Profile

The Brief Profile summarizes the non-confidential data on substances as it is held in the databases of the European Chemicals Agency (ECHA), including data provided by third parties. The Brief Profile is automatically generated; note that it does not currently distinguish between harmonised classification and minimum classification; information requirements under different legislative frameworks may therefore not be fully up to date or complete. For accuracy reasons, substance manufacturers and imports have the responsibility to consult official sources, e.g. the electronic edition of the Official Journal of the European Union.
This Brief Profile is covered by the ECHA Legal Notice.

Substance Description

Substance identity

EC / List no.:
201-150-1
CAS no.:
78-85-3
Index number:
Molecular formula:
C4H6O
SMILES:
CC(=C)C=O
InChI:
InChI=1S/C4H6O/c1-4(2)3-5/h3H,1H2,2H3
Type of substance:
Mono constituent substance
Origin:
Organic
Registered compositions:
4
Of which contain:
0 impurities relevant for classification
0 additives relevant for classification
Substance Listed:
EINECS (European INventory of Existing Commercial chemical Substances) List

Hazard classification & labelling

Danger! According to the classification provided by companies to ECHA in REACH registrations this substance is fatal if inhaled, is toxic if swallowed, is toxic in contact with skin, causes severe skin burns and eye damage, is very toxic to aquatic life, is very toxic to aquatic life with long lasting effects, is a highly flammable liquid and vapour and is suspected of causing genetic defects.

Additionally, the classification provided by companies to ECHA in CLP notifications identifies that this substance is fatal if swallowed, is fatal in contact with skin, causes serious eye damage and causes skin irritation.

Breakdown of all 151 C&L notifications submitted to ECHA

Acute Tox. 3 H301
Flam. Liq. 2 H225
Acute Tox. 3 H311
Skin Corr. 1B H314
Acute Tox. 2 H330
Aquatic Acute 1 H400
Aquatic Chronic 1 H410
Muta. 2 H341
Eye Dam. 1 H318
Acute Tox. 2 H300
Acute Tox. 2 H310
Eye Irrit. 2 H319
Skin Irrit. 2 H315
Acute Tox. 4 H312
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

https://echa.europa.eu/o/diss-blank-theme/images/cnl/graph/tick.png Harmonised Classification

https://echa.europa.eu/o/diss-blank-theme/images/cnl/graph/Reach.png REACH registration dossiers notifications

https://echa.europa.eu/o/diss-blank-theme/images/cnl/graph/CLP.png CLP notifications

Properties of concern

Regulatory context

Registration, Evaluation, Authorisation & Restriction of Chemicals (REACH)

Registration
Pre-registration:
Substance pre-registered under REACH.
Registration:
This substance has 3 active registrations under REACH, 1 Joint Submission(s) and 0 Individual Submission(s).
Please see Registrants/Suppliers details.
Evaluation
Dossier Evaluation:
Substance Evaluation:
Authorisation
Candidate List:
Annex XIV (Authorisation List):
Restriction
Annex XVII (Restriction List):

Persistent Organic Pollutants Regulation (POPs)

List of substances subject to the POPs Regulation:
List of substances proposed as POPs:

Classification Labelling & Packaging (CLP)

Harmonised C&L:
Seveso Annex I:
Notified C&L:
Classification & Labelling has been notified by industry to ECHA for this substance.

Biocidal Products Regulation (BPR)

Active Substance:
Biocidal Products:

Prior Informed Consent (PIC)

Annex I:
Annex V:

European Union Observatory for Nanomaterials (EUON)

EUON:

About this substance

This substance is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, for intermediate use only.

This substance is used at industrial sites and in manufacturing.

ECHA has no public registered data indicating whether or in which chemical products the substance might be used.

ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment.

ECHA has no public registered data on the use of this substance in activities or processes at the workplace.

ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment.

ECHA has no public registered data indicating whether or into which articles the substance might have been processed.

ECHA has no public registered data indicating whether or in which chemical products the substance might be used.

ECHA has no public registered data on the types of manufacture using this substance.

ECHA has no public registered data on the use of this substance in activities or processes at the workplace.

ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment.

ECHA has no public registered data indicating whether or in which chemical products the substance might be used.

ECHA has no public registered data on the use of this substance in activities or processes at the workplace.

ECHA has no public registered data on the routes by which this substance is most likely to be released to the environment.

This substance has an industrial use resulting in manufacture of another substance (use of intermediates).

This substance is used for the manufacture of: chemicals.

This substance is used in the following activities or processes at workplace: closed processes with no likelihood of exposure, transfer of chemicals at dedicated facilities, closed, continuous processes with occasional controlled exposure, closed batch processing in synthesis or formulation, mixing in open batch processes, transfer of substance into small containers and laboratory work.

Release to the environment of this substance can occur from industrial use: as an intermediate step in further manufacturing of another substance (use of intermediates).

This substance is used in the following activities or processes at workplace: closed processes with no likelihood of exposure, laboratory work, closed, continuous processes with occasional controlled exposure, closed batch processing in synthesis or formulation, mixing in open batch processes, transfer of chemicals at dedicated facilities and transfer of substance into small containers.

Release to the environment of this substance can occur from industrial use: manufacturing of the substance.

ECHA has no data from registration dossiers on the precautionary measures for using this substance. Guidance on the safe use of the substance provided by manufacturers and importers of this substance.

Registrants/suppliers

  • BASF SE, Carl-Bosch-Str. 38 67056 Ludwigshafen am Rhein Rheinland-Pfalz Germany
  • Givaudan Flavours Barneveld, Nijverheidsweg 60 3770 Barneveld Netherlands
  • Röhm GmbH, Deutsche-Telekom-Allee 9 64295 Darmstadt Germany

Substance names and other identifiers

Methacrylaldehyde
EC Inventory, REACH pre-registration
Methacrylaldehyde
REACH pre-registration, Other
METHACRYLALDEHYDE, STABILIZED
Inland Transport of Dangerous Goods Directive, Annex III - ADN, Inland Transport of Dangerous Goods Directive, Annex I - ADR, Inland Transport of Dangerous Goods Directive, Annex II - RID
2-Methyl -2-propenal
Registration dossier
2-methylprop-2-enal
C&L Inventory, Other
2-Propenal, 2-methyl-
C&L Inventory
Methacrolein
Registration dossier
Methacrolein (stabilized with HQ)
C&L Inventory
methacrylaldehyde
C&L Inventory, Registration dossier
Methyl-2-propenal
C&L Inventory
2-Methyl-2-propen-1-al
Registration dossier
Methacrolein
Registration dossier
Methacrylaldehyd
Registration dossier
78-85-3
CAS number
EC Inventory, C&L Inventory, Registration dossier, REACH pre-registration, Other, Inland Transport of Dangerous Goods Directive, Annex III - ADN, Inland Transport of Dangerous Goods Directive, Annex I - ADR, Inland Transport of Dangerous Goods Directive, Annex II - RID

Scientific properties

Physical and chemical properties

This section provides physicochemical information compiled from all automatically processable data from REACH registration dossiers that is available to ECHA at the time of generation. The quality and correctness of the information remains the responsibility of the data submitter. The Agency thus cannot guarantee the correctness of the information displayed.

Appearance/physical state / colour

Study results
  • 2 studies submitted
  • 2 studies processed
C Physical state at 20°C and 1013 hPa
Liquid (100%) [2]
C Form
Liquid (100%) [2]
C Odour
Other (100%) [1]
C Substance type
Organic (100%) [2]

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence 2
Other
Data waiving
no waivers
C Summaries
  • 1 summary submitted
  • 1 summary processed
Physical state at 20°C and 1013 hPa
Liquid (100%)

Melting/freezing point

Study results
  • 3 studies submitted
  • 3 studies processed
R Melting / freezing point
-81 °C [3]

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence 3
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Melting / freezing point at 101 325 Pa
-81 °C

Boiling point

Study results
  • 4 studies submitted
  • 3 studies processed
R Boiling point
68 - 69 °C @ 101.3 kPa [3]

Type of Study provided
Studies with data
Key study
Supporting study 1
Weight of evidence 3
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Boiling point at 101 325 Pa
68.4 °C

Density

Study results
  • 4 studies submitted
  • 1 study processed
R Density
0.799 - 0.838 g/cm³ @ 25 - 60 °C [3]

Type of Study provided
Studies with data
Key study 1
Supporting study 3
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Vapour pressure

Study results
  • 5 studies submitted
  • 1 study processed
R Vapour pressure
20 - 98 kPa @ 25.6 - 66.94 °C [2]

Type of Study provided
Studies with data
Key study 1
Supporting study 4
Weight of evidence
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Vapour pressure
20 kPa @ 25.6 °C

Partition coefficient

Study results
  • 1 study submitted
  • 1 study processed
R Log Pow
0.9 @ 23 °C and pH 4 - 9 [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Log Kow (Log Pow)
0.9 @ 23 °C

Water solubility

Study results
  • 3 studies submitted
  • 3 studies processed
R Water solubility (mass/vol.)
50 - 68.4 g/L @ 20 - 25 °C [3]

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence 3
Other
Data waiving
no waivers
Summaries
  • 0 summaries submitted
  • 0 summaries processed

No data available

Solubility in organic solvents / fat solubility

Data not provided by the registrant

Surface tension

Study results
  • 1 study submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified 1
Exposure cons.
Other
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Flash point

Study results
  • 3 studies submitted
  • 3 studies processed
R Flash point
-15 - 2 °C @ 101.3 kPa [3]

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence 3
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Flash point at 101 325 Pa
-15 °C

Auto flammability

Study results
  • 4 studies submitted
  • 2 studies processed
R Autoflammability / self-ignition
210 - 295 °C @ 101.3 - 101.325 kPa [4]

Type of Study provided
Studies with data
Key study 1
Supporting study 2
Weight of evidence 1
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Autoflammability / self-ignition at 101 325 Pa
210 °C

Flammability

Study results
  • 4 studies submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible 2
Sci. unjustified 2
Exposure cons.
Other
C Summaries
  • 1 summary submitted
  • 1 summary processed
Flammability
Highly flammable (100%)

Explosiveness

Study results
  • 1 study submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified 1
Exposure cons.
Other
C Summaries
  • 1 summary submitted
  • 1 summary processed
Explosiveness
Non-explosive (100%)

Oxidising

Study results
  • 1 study submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified 1
Exposure cons.
Other
C Summaries
  • 1 summary submitted
  • 1 summary processed
Oxidising
No (100%)

Oxidation reduction potential

Data not provided by the registrant

pH

Data not provided by the registrant

Dissociation constant

Study results
  • 1 study submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible 1
Sci. unjustified
Exposure cons.
Other
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Viscosity

Study results
  • 3 studies submitted
  • 3 studies processed
R dynamic viscosity (in mPa s)
0.49 [3]

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence 2 1
Other
Data waiving
no waivers
R Summaries
  • 1 summary submitted
  • 1 summary processed
Dynamic viscosity at 20 °C
0.49 mPa.s

Environmental fate and pathways

This section provides environmental fate and pathways information compiled from all automatically processable data from REACH registration dossiers that is available to ECHA at the time of generation. The quality and correctness of the information remains the responsibility of the data submitter. The Agency thus cannot guarantee the correctness of the information displayed.

Phototransformation in air

Study results
  • 1 study submitted
  • 1 study processed
R Dissipation half life (DT50)
11.164 h [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Hydrolysis

Study results
  • 1 study submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified 1
Exposure cons.
Other
Summaries
  • 0 summaries submitted
  • 0 summaries processed

No data available

Phototransformation in water

Data not provided by the registrant

Phototransformation in soil

Data not provided by the registrant

Biodegradation in water - screening tests

Study results
  • 1 study submitted
  • 1 study processed
C Interpretation of results
Readily biodegradable (100%) [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
C Summaries
  • 1 summary submitted
  • 1 summary processed
Biodegradation in water
Readily biodegradable (100%)

Biodegradation in water & sediment - simulation tests

Data not provided by the registrant

Biodegradation in soil

Data not provided by the registrant

Bioaccumulation: aquatic / sediment

Study results
  • 1 study submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified
Exposure cons.
Other 1
Summaries
  • 0 summaries submitted
  • 0 summaries processed

No data available

Bioaccumulation: terrestrial

Data not provided by the registrant

Adsorption/desorption

Study results
  • 1 study submitted
  • 0 studies processed

No automatically processable data submitted

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Henrys law constant (H)

Study results
  • 1 study submitted
  • 1 study processed
R H - (pressure) m³/mol
5.68 Pa m³/mol @ 25 °C [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Distribution modelling

Data not provided by the registrant

Ecotoxicological information

This section provides ecotoxicological information compiled from all automatically processable data from REACH registration dossiers that is available to ECHA at the time of generation. The quality and correctness of the information remains the responsibility of the data submitter. The Agency thus cannot guarantee the correctness of the information displayed.

Predicted No-Effect Concentration (PNEC)

Data not provided by the registrant

Short–term toxicity to fish

Study results
  • 2 studies submitted
  • 1 study processed
P/RResults
LC50 (4 days) 19.5 µg/L [1]
EC50 (4 days) 19.5 µg/L [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence 1
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Long–term toxicity to fish

Study results
  • 1 study submitted
  • 1 study processed
P/RResults
NOEC (60 days) 11.4 µg/L [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Short–term toxicity to aquatic invertebrates

Study results
  • 2 studies submitted
  • 1 study processed
P/RResults
EC50 (48 h) 938 µg/L [1]

Type of Study provided
Studies with data
Key study 1
Supporting study 1
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Long–term toxicity to aquatic invertebrates

Study results
  • 1 study submitted
  • 1 study processed
P/RResults
NOEC (64 days) 16.9 µg/L [1]
LOEC (64 days) 33.6 µg/L [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Toxicity to aquatic algae and cyanobacteria

Study results
  • 2 studies submitted
  • 1 study processed
P/RResults
EC50 (72 h) 26 - 61 µg/L [2]
NOEC (72 h) 10 µg/L [2]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence 1
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Toxicity to aquatic plants other than algae

Data not provided by the registrant

Toxicity to microorganisms

Study results
  • 1 study submitted
  • 1 study processed
P/RResults
EC50 (30 min) 400 mg/L [1]

Type of Study provided
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Sediment toxicity

Data not provided by the registrant

Endocrine disrupter testing in aquatic vertebrates – in vivo

Data not provided by the registrant

Toxicity to terrestrial macroorganisms except arthropods

Data not provided by the registrant

Toxicity to terrestrial arthropods

Data not provided by the registrant

Toxicity to terrestrial plants

Data not provided by the registrant

Toxicity to soil microorganisms

Data not provided by the registrant

Toxicity to birds

Data not provided by the registrant

Toxicity to mammals

Data not provided by the registrant

Toxicological information

This section provides toxicological information compiled from all automatically processable data from REACH registration dossiers that is available to ECHA at the time of generation. The quality and correctness of the information remains the responsibility of the data submitter. The Agency thus cannot guarantee the correctness of the information displayed.

Derived No- or Minimal Effect Level (DN(M)EL)

Data not provided by the registrant

Toxicokinetics, metabolism, and distribution

Data not provided by the registrant

Acute toxicity

Study results
oral
  • 1 study submitted
  • 1 study processed
P/RResults
LD50 140 mg/kg bw (rat) [1]

Type of Study provided
oral
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
inhalation
  • 1 study submitted
  • 1 study processed
P/RResults
LC50 (4 h) 500 - 600 mg/m³ air (rat) [3]

inhalation
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
dermal
  • 1 study submitted
  • 1 study processed
P/RResults
LD50 364 mg/kg bw (rabbit) [1]

dermal
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
no waivers
other routes
  • 0 studies submitted
  • 0 studies processed

No data available

other routes
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Irritation / corrosion

Study results
Study data: skin
  • 2 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Study data: skin
Studies with data
Key study 1
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified 1
Exposure cons.
Other
Study data: eye
  • 1 study submitted
  • 0 studies processed

Study data not processed for brief profile

Study data: eye
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified
Exposure cons.
Other 1
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Sensitisation

Study results
Study data: skin
  • 1 study submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Study data: skin
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
Not feasible
Sci. unjustified
Exposure cons.
Other 1
Study data: respiratory
  • 0 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Study data: respiratory
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 0 summaries submitted
  • 0 summaries processed

No data available

Repeated dose toxicity

Study results
Study data: oral
  • 0 studies submitted
  • 0 studies processed

No data available

Type of Study provided
Study data: oral
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Study data: inhalation
  • 2 studies submitted
  • 0 studies processed

No automatically processable data submitted

Study data: inhalation
Studies with data
Key study 1
Supporting study 1
Weight of evidence
Other
Data waiving
no waivers
Study data: dermal
  • 0 studies submitted
  • 0 studies processed

No data available

Study data: dermal
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Genetic toxicity

Study results
Study data: in vitro
  • 4 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Study data: in vitro
Studies with data
Key study 2
Supporting study 2
Weight of evidence
Other
Data waiving
no waivers
Study data: in vivo
  • 0 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Study data: in vivo
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Carcinogenicity

Data not provided by the registrant

Toxicity to reproduction

Study results
Study data: reproduction
  • 0 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Type of Study provided
Study data: reproduction
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Study data: developmental
  • 2 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Study data: developmental
Studies with data
Key study 1
Supporting study
Weight of evidence 1
Other
Data waiving
no waivers
Study data: other studies
  • 0 studies submitted
  • 0 studies processed

Study data not processed for brief profile

Study data: other studies
Studies with data
Key study
Supporting study
Weight of evidence
Other
Data waiving
no waivers
Summaries
  • 1 summary submitted
  • 0 summaries processed

No automatically processable data submitted

Neurotoxicity

Data not provided by the registrant

Immunotoxicity

Data not provided by the registrant

Endocrine disrupter mammalian screening - in vivo

Data not provided by the registrant