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EC number: 685-521-7 | CAS number: 98796-53-3
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
No data is available for the target substance N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxyadenosine, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]. Thus, data from a suitable read-across partner was used to assess the potential of the target substance to induce eye and skin irritation.
The potential of 5’-O-[bis(4-methoxyphenyl)phenylmethyl]-2’-deoxythymidine, 3’-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite] (source substance) to induce skin irritation (OECD 439) and eye irritation (OECD 492) was tested in suitable in vitro test methods. In both tests, the source substance was tested as negative. Based on the results from the read-across partner, the target substance can be considered as non-irritant to the skin and eye.
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- For justification of read-across please refer to the read-across report attached to IUCLID section 13.
- Reason / purpose for cross-reference:
- read-across source
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- mean of three tissues
- Value:
- 94
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Remarks on result:
- no indication of irritation
- Other effects / acceptance of results:
- For detailed results see Table 1 in box "Any other information on results incl. tables".
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- In this study under the given conditions, 5’-O-[bis(4-methoxyphenyl)phenylmethyl]-2’-deoxythymidine, 3’-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite] showed no irritant effects. The relative mean tissue viability after 60 min of exposure and 42 h post-incubation was > 50%. The test item is therefore classified as “non-irritant” in accordance with UN GHS “No Category”.
- Executive summary:
In a primary dermal irritation study conducted according to OECD guideline 439, the EpiDerm™-Model (EPI-200-SIT) was topically exposed to 5’-O-[bis(4-methoxyphenyl)phenylmethyl]-2’-deoxythymidine, 3’-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite] (purity 99.7%) for 60 mins followed by a 42 h post-incubation period. Irritant potential of the test item was predicted from the relative mean tissue viabilities obtained compared to the corresponding negative control tissues concurrently treated with DPBS. The mean relative tissue viability (% negative control) was > 50% (94.0%). Based on this result, the test item is classified as a non-irritant according to the UN GHS.
This information is used in a read-across approach in the assessment of the target substance.
For justification of read-across please refer to the attached read-across report (see IUCLID section 13).
Reference
Results of the Pre-Experiments:
The mixture of 25 mg of the test item per 1 mL MTT medium showed no reduction of MTT compared to the solvent. The mixture did not turn blue/purple. Therefore, NSMTT was determined to be 0%.
The mixture of 25 mg of the test item per 300 µL aqua dest. or per 300 µL isopropanol showed no colouring detectable by unaided eye assessment. Therefore, NSC was determined to be 0%.
Results of the main experiment:
Table 1: Result of the Test Item 5’-O-[bis(4-methoxyphenyl)phenylmethyl]-2’-deoxythymidine, 3’-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]
Name |
Negative Control |
Positive Control |
Test Item |
||||||
Tissue |
1 |
2 |
3 |
1 |
2 |
3 |
1 |
2 |
3 |
Absolute OD570 |
1.518 |
1.533 |
1.619 |
0.123 |
0.119 |
0.112 |
1.483 |
1.444 |
1.461 |
1.554 |
1.471 |
1.578 |
0.124 |
0.121 |
0.111 |
1.480 |
1.427 |
1.437 |
|
OD570(Blank Corrected) |
1.475 |
1.489 |
1.576 |
0.080 |
0.075 |
0.068 |
1.439 |
1.400 |
1.418 |
1.510 |
1.428 |
1.535 |
0.080 |
0.078 |
0.067 |
1.437 |
1.383 |
1.394 |
|
Mean OD570of the Duplicates (Blank Corrected) |
1.493 |
1.459 |
1.555 |
0.080 |
0.076 |
0.068 |
1.438 |
1.392 |
1.406 |
Total Mean OD570of 3 Replicate Tissues (Blank Corrected) |
1.502* |
0.075 |
1.412 |
||||||
SD OD570 |
0.049 |
0.006 |
0.024 |
||||||
Relative Tissue Viability [%] |
99.4 |
97.1 |
103.5 |
5.3 |
5.1 |
4.5 |
95.7 |
92.6 |
93.6 |
Mean Relative Tissue Viability [%] |
100.0 |
5.0** |
94.0 |
||||||
SD Tissue Viability [%]*** |
3.3 |
0.4 |
1.6 |
||||||
CV [% Viabilities] |
3.3 |
8.4 |
1.7 |
* Blank-corrected mean OD570 nm of the negative control corresponds to 100% absolute tissue viability.
**Mean relative tissue viability of the three positive control tissues is≤ 20%.
*** Standard deviation (SD) obtained from the three concurrently tested tissues is ≤ 18%.
Table 2: Quality Criteria
|
Value |
Cut off |
pass/fail |
Mean Absolute OD570 nmNK |
1.545 |
0.8 ≤ NK ≤ 2.8 |
pass |
Relative Viability [%] PC |
5.0 |
≤ 20% |
pass |
SD Viability[%] |
0.4 -3.3 |
≤ 18% |
pass |
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Eye irritation
Link to relevant study records
- Endpoint:
- eye irritation: in vitro / ex vivo
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- For justification of read-across please refer to the read-across report attached to IUCLID section 13.
- Reason / purpose for cross-reference:
- read-across source
- Irritation parameter:
- other: Relative Tissue Viability [%]
- Run / experiment:
- Mean of replicates
- Value:
- 64.7
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Remarks on result:
- other: First experiment, borderline results (60 +/- 5%)
- Irritation parameter:
- other: Relative Tissue Viability [%]
- Run / experiment:
- Mean of triplicates
- Value:
- 92.7
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Remarks on result:
- other: Experiment II, no indication of irritation
- Other effects / acceptance of results:
- The test item showed no irritant effects. The mean relative tissue viability (% negative control) was > 60% (64.7%). As the results were within the borderline values (60 ± 5%), a second experiment was performed to confirm the first results. The mean relative tissue viability (% negative control) of the second experiment was > 60% (92.7%). The controls confirmed the validity of the study. The mean absolute OD570 of the two negative control tissues was > 0.8 and < 2.5 (1.661 (Experiment 1), 1.480 (Repeated Experiment)). The mean relative tissue viability (% negative control) of the positive control was < 50% (18.6% (Experiment 1), 22.3% (Repeated Experiment)). The maximum inter tissue difference of replicate tissues of all dose groups was < 20% (19.2%). For detailed information please refer to Table 1 and Table 2 in box "Any other information on results incl. tables".
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- In this study under the given conditions the test item showed no irritant effects. The test item is classified as “non-irritant“ in accordance with UN GHS “No Category” for eye irritation.
- Executive summary:
In the present study the eye irritant potential of 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxythymidine, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite] (99.7% purity) was analysed according to OECD 492 using the three-dimensional human corneal epithelium model EpiOcular, consisting of normal, human-derived epidermal keratinocytes mimicking characteristics of the corneal epithelium. Hereby, 50 mg of the test item was applied directly atop the EpiOcular™ tissue. Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT after a 6 hours exposure and 18-hour post-incubation period and compared to those of the concurrent negative controls. The mixture of 50 mg test item per 1 mL Aqua dest. showed colouring as compared to the solvent. Thus, coloured tissue controls were included and used for quantitative correction of results. The test item showed no irritant effects. The mean relative tissue viability of two replicates (% negative control) was > 60% (64.7%). As the results were within the borderline range of 60 +/- 5%, a second experiment was performed to confirm the results. The mean relative tissue viability (% negative control) of the second experiment was > 60% (92.7%). Based on the results, the test item is considered to be non-irritating to the eye in accordance with UN GHS “No Category”.
This information is used in a read-across approach in the assessment of the target substance.
For justification of read-across please refer to the attached read-across report (see IUCLID section 13).
Reference
Table 1: Main results first experiment |
||||||
Name |
Negative Control |
Positive Control |
Test item |
|||
Tissue |
1 |
2 |
1 |
2 |
1 |
2 |
OD570values |
1.823 |
1.516 |
0.314 |
0.380 |
0.927 |
1.246 |
1.801 |
1.505 |
0.308 |
0.377 |
0.943 |
1.247 |
|
OD570values |
1.780 |
1.473 |
0.271 |
0.337 |
0.884 |
1.203 |
1.758 |
1.462 |
0.265 |
0.334 |
0.900 |
1.204 |
|
mean of the duplicates |
1.769 |
1.468 |
0.268 |
0.336 |
0.892 |
1.203 |
mean OD |
1.618* |
0.302 |
1.048 |
|||
TODTT |
- |
- |
1.045 |
|||
SD of mean OD |
0.213 |
0.048 |
0.220 |
|||
tissue viability [%] |
109.3 |
90.7 |
16.6 |
20.7 |
55.1 |
74.4 |
relative tissue viability difference [%]*** |
18.6 |
4.2 |
19.2 |
|||
mean tissue viability [%] |
100.0 |
18.6** |
64.7 |
|||
mean tissue viability [%] |
- |
- |
64.5 |
Table 2: Main results second experiment |
||||||
Name |
Negative Control |
Positive Control |
Test item |
|||
Tissue |
1 |
2 |
1 |
2 |
1 |
2 |
OD570values |
1.352 |
1.606 |
0.316 |
0.413 |
1.381 |
1.402 |
1.366 |
1.598 |
0.319 |
0.405 |
1.298 |
1.420 |
|
OD570values |
1.308 |
1.563 |
0.273 |
0.369 |
1.338 |
1.359 |
1.323 |
1.554 |
0.276 |
0.362 |
1.254 |
1.377 |
|
mean of the duplicates |
1.769 |
1.468 |
0.274 |
0.365 |
1.296 |
1.368 |
mean OD |
1.437* |
0.320 |
1.332 |
|||
TODTT |
- |
- |
1.330 |
|||
SD of mean OD |
0.172 |
0.064 |
0.051 |
|||
tissue viability [%] |
91.5 |
108.5 |
19.1 |
25.4 |
90.2 |
95.2 |
relative tissue viability difference [%]*** |
16.9 |
6.3 |
5.0 |
|||
mean tissue viability [%] |
100.0 |
22.3** |
92.7 |
|||
mean tissue viability [%] |
- |
- |
92.5 |
* corrected mean OD570 of the negative control corresponds to 100% absolute tissue viability
* corrected mean OD570 of the negative control corresponds to 100% absolute tissue viability
** mean relative tissue viability of the positive control is < 50%
*** relative tissue viability difference of replicate tissues is < 20%
Table 2: Acceptance Criteria | ||||
Value | Cut-off | pass/fail | ||
Mean absolute OD570 NK | 1.661 (Experiment 1) 1.480 (Experiment 2) |
0.8 < NK < 2.5 | pass | |
Mean relative viability PC [%] | 18.6 (Experiment 1) 22.3 (Experiment II) |
< 50% | pass | |
Max difference of % viability [%] | 19.2 | < 20% | pass |
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
No data is available for the target substance N-benzoyl-5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-deoxyadenosine, 3′-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite]. Thus, data from a suitable read-across partner was used to assess the potential of the target substance to induce eye and skin irritation. Details on the read-across rationale are provided in IUCLID section 13.
The potential of 5’-O-[bis(4-methoxyphenyl)phenylmethyl]-2’-deoxythymidine, 3’-[2-cyanoethyl N,N-bis(1-methylethyl)phosphoramidite] (source substance) to induce skin irritation (OECD 439) and eye irritation (OECD 492) was tested in suitable in vitro test methods. In both tests, the source substance was tested as negative. Based on the results from the read-across partner, the target substance can be considered as non-irritant to the skin and eye.
Justification for classification or non-classification
Based on available data from a suitable read-across partner, no classification for skin and/or eye irritation is warranted for the target substance.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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