2H-1-Benzopyran, 6-fluoro-3,4-dihydro-2-[(2S)-2-oxiranyl]-, (2S)-

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-10-11 to 2016-11-01

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.1 (Acute Toxicity (Oral))

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.1100 (Acute Oral Toxicity)

Deviations:

no

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: JMAFF No 8147, 11/2000

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

(2S)-6-fluoro-2-[(2S)-oxiran-2-yl]chromane [S-(R*,R*)]

EC Number:

603-314-1

Cas Number:

129050-23-3

Molecular formula:

C11H11FO2

IUPAC Name:

(2S)-6-fluoro-2-[(2S)-oxiran-2-yl]chromane [S-(R*,R*)]

Test material form:

liquid: viscous

Details on test material:

- Physical state: liquid (viscous)
- Appearance: clear viscous liquid

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Janssen Pharmaceutica N.V., I16DB1991
- Expiration date of the lot/batch: 2017-07-25 (retest date)

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature
- Stability under test conditions: no data
- Solubility and stability of the test substance in the solvent/vehicle: no data

OTHER SPECIFICS
- Correction factor: 1

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: 6 female rats (nulliparous and non-pregnant), Wistar strain Crl:WI (Han) (outbred, SPF-Quality); Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: approx. 8 weeks old
- Weight at study initiation: 137-166 grams
- Fasting period before study: Animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test item. Water was available ad libitum.
- Housing: Group housing of 3 animals per cage in labeled Makrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Lignocel S 8-15, JRS- J. Rettenmaier & Sohne GmbH + CO. KG, Rosenberg, Germany) and paper as cage enrichment (Enviro-dri, Wm. Lillico &Son (Wonham Mill Ltd.), Surrey, United Kingdom).
- Diet (e.g. ad libitum): Free access to pelleted rodent diet
- Water (e.g. ad libitum): Free access to tap water.
- Acclimation period: At least 5 days before start of treatment under laboratory conditions

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 to 24°C
- Humidity (%): 40 to 70%
- Air changes (per hr): at least 10 air changes/hour
- Photoperiod (hrs dark / hrs light): 12-hour light/12-hour dark cycle

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

unchanged (no vehicle)

Details on oral exposure:

MAXIMUM DOSE VOLUME APPLIED: 1.60 mL/kg

DOSAGE PREPARATION (if unusual): The test item was dosed undiluted as delivered by the Sponsor. No correction was made for purity of the test item as the correction factor is 1. Adjustment was made for specific gravity of the test item.

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: The toxicity of the test item was assessed by stepwise treatment of groups of 3 females. The first group was treated at a dose level of 2000 mg/kg. The absence or presence of mortality of animals dosed at one step determined the next step, based on the test procedure defined in the guidelines. The onset, duration and severity of the signs of toxicity were taken into account for determination of the time interval between the dose groups.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

3 females per dose

Control animals:

no

Details on study design:

- Duration of observation period following administration: 15 days
- Frequency of observations and weighing:
Mortality/Viability: Twice daily. The time of death was recorded as precisely as possible.
Body weights: Days 1 (pre-administration), 8 and 15 and at death (if found dead after Day 1).
Clinical signs: At periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The signs were graded according to fixed scales and the time of onset, degree and duration were recorded:
Maximum grade 4: grading slight (1) to very severe (4)
Maximum grade 3: grading slight (1) to severe (3)
Maximum grade 1: presence is scored (1).
- Necropsy of survivors performed: Yes; The animals surviving to the end of the observation period were sacrificed by oxygen/carbon dioxide procedure. All animals assigned to the study were subjected to necropsy and descriptions of all internal macroscopic abnormalities recorded.

Statistics:

No statistical analysis was performed.

Results and discussion

Effect levels

Key result

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

One animal was found dead on Day 1 and one animal was found dead on Day 2. No further mortality occurred.

Clinical signs:

Hunched posture, flat posture, lateral recumbency, piloerection, lethargy, uncoordinated movements, shallow respiration, slow breathing, ptosis and/or cold to touch were noted for all animals between Days 1 and 3. Additionally, piloerection was noted for two animals between Days 8 and 10.

Body weight:

The mean body weight gain shown by the surviving animals over the study period was considered to be similar to that expected for normal untreated animals of the same age and strain.

Gross pathology:

Isolated black foci of the glandular mucosa of the stomach was found in one of the animals found dead, at macroscopic post mortem examination. Macroscopic post mortem examination of the surviving animals at termination did not reveal any toxicologically relevant abnormalities. Autolysis was noted for one of the animals found dead, at macroscopic post mortem examination. This was considered to be not toxicologically relevant.

Applicant's summary and conclusion

Interpretation of results:

Category 5 based on GHS criteria

Conclusions:

The oral LD50 value of T001598 in Wistar rats was established to exceed 2000 mg/kg body weight.
According to the OECD 423 test guideline, the LD50 cut-off value was considered to be 2500 mg/kg body weight.
According to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2015) (including all amendments), T001598 should be classified as: may be harmful if swallowed (Category 5) for acute toxicity by the oral route.
According to the Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures (including all amendments), T001598 does not have to be classified and has no obligatory labelling requirement for oral toxicity.