2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate

Endpoint summary

Description of key information

Skin irritation

The dermal irritation potential of target chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) was assessedin various experimental studies which were conducted on rabbits for target chemical2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7). The predicted data usingQSAR toolbox and Danish QSAR databasehas also been compared with the experimental data.Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is unable to cause skin irritation and thus considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

 

Eye irritation

An ocular irritation potential of target chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) was assessedin various experimental studies which were conducted on rabbits for target chemical2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7). The predicted data usingQSAR toolboxhas also been compared with the experimental data.Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is unable to cause eye damage and thus can be considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

(Q)SAR

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification

Justification for type of information:

Data is from OECD QSAR toolbox version 3.4 and QMRF report has been attached

Qualifier:

according to guideline

Guideline:

other: estimated data

Principles of method if other than guideline:

Prediction is done using QSAR Toolbox version 3.4

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material (IUPAC name): 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate
- Molecular formula: C9H13NO7S2
- Molecular weight: 311.3337 g/mol
- Smiles notation: COC1=C(C=CC(=C1)S(=O)(=O)CCOS(=O)(=O)O)N
- InChl: 1S/C9H13NO7S2/c1-16-9-6-7(2-3-8(9)10)18(11,12)5-4-17-19(13,14)15/h2-3,6H,4-5,10H2,1H3,(H,13,14,15)
- Substance type: Organic
- Physical state: Solid

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

No data available

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

not specified

Controls:

not specified

Amount / concentration applied:

No data available

Duration of treatment / exposure:

24 hours

Observation period:

72 hours

Number of animals:

3

Details on study design:

No data available

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

72 h

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No skin irritation was observed.

Estimation method: Takes mode value from the 5 nearest neighbours
Domain  logical expression:Result: In Domain

(((((((("a" or "b" or "c" or "d" or "e" or "f" )  and ("g" and ( not "h") )  )  and ("i" and ( not "j") )  )  and "k" )  and "l" )  and "m" )  and ("n" and ( not "o") )  )  and ("p" and "q" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Anilines (Acute toxicity) AND Vinyl Sulfones by US-EPA New Chemical Categories

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Radical AND Radical >> Radical mechanism via ROS formation (indirect) AND Radical >> Radical mechanism via ROS formation (indirect) >> Single-Ring Substituted Primary Aromatic Amines AND SN1 AND SN1 >> Nucleophilic attack after nitrenium ion formation AND SN1 >> Nucleophilic attack after nitrenium ion formation >> Single-Ring Substituted Primary Aromatic Amines by DNA binding by OASIS v.1.4

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Primary aromatic amine by DNA binding by OECD

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as Strong binder, NH2 group by Estrogen Receptor Binding

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as AN2 AND AN2 >> Michael-type addition to quinoid structures  AND AN2 >> Michael-type addition to quinoid structures  >> Substituted Anilines by Protein binding by OASIS v1.4

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Anilines (Unhindered) by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Primary aromatic amine by DNA binding by OECD

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Acylation OR Acylation >> Direct Addition of an Acyl Halide OR Acylation >> Direct Addition of an Acyl Halide >> Alkyl carbamyl halides OR Michael addition OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Arenes OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Hydroquinones OR No alert found OR SN1 >> Iminium Ion Formation OR SN1 >> Iminium Ion Formation >> Aliphatic tertiary amines OR SN1 >> Nitrenium Ion formation >> Aromatic azo OR SN1 >> Nitrenium Ion formation >> Aromatic nitro OR SN1 >> Nitrenium Ion formation >> Primary (unsaturated) heterocyclic amine OR SN1 >> Nitrenium Ion formation >> Secondary aromatic amine OR SN1 >> Nitrenium Ion formation >> Tertiary aromatic amine OR SN2 OR SN2 >> SN2 at an sp3 Carbon atom OR SN2 >> SN2 at an sp3 Carbon atom >> Phosphates by DNA binding by OECD

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as (!Undefined)Group All Lipid Solubility < 0.01 g/kg AND (!Undefined)Group CNS Surface Tension > 62 mN/m AND Group All log Kow < -3.1 AND Group All Melting Point > 200 C AND Group CNS log Kow < 0.5 AND Group CNS log Kow < -2 AND Group CNS Melting Point > 120 C AND Group CNS Melting Point > 50 C by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as (!Undefined)Group CN Lipid Solubility < 0.4 g/kg OR (!Undefined)Group CNHal Lipid Solubility < 4 g/kg OR (!Undefined)Group CNHal Lipid Solubility < 400 g/kg OR Group CN Aqueous Solubility < 0.0001 g/L OR Group CN Aqueous Solubility < 0.1 g/L OR Group CN log Kow > 4.5 OR Group CN log Kow > 5.5 OR Group CN Melting Point > 180 C OR Group CN Molecular Weight > 290 g/mol OR Group CN Vapour Pressure < 0.001 Pa OR Group CNHal Aqueous Solubility < 0.001 g/L OR Group CNHal Aqueous Solubility < 0.1 g/L OR Group CNHal log Kow > 3.8 OR Group CNHal Molecular Weight > 370 g/mol OR Group CNHal Molecular Weight > 380 g/mol by Skin irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as Bioavailable by Lipinski Rule Oasis ONLY

Domain logical expression index: "l"

Similarity boundary:Target: COc1cc(S(=O)(=O)CCOS(O)(=O)=O)ccc1N
Threshold=30%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "m"

Similarity boundary:Target: COc1cc(S(=O)(=O)CCOS(O)(=O)=O)ccc1N
Threshold=20%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "n"

Referential boundary: The target chemical should be classified as No alert found by in vitro mutagenicity (Ames test) alerts by ISS

Domain logical expression index: "o"

Referential boundary: The target chemical should be classified as Primary aromatic amine,hydroxyl amine and its derived esters by in vitro mutagenicity (Ames test) alerts by ISS

Domain logical expression index: "p"

Parametric boundary:The target chemical should have a value of log Kow which is >= -3.99

Domain logical expression index: "q"

Parametric boundary:The target chemical should have a value of log Kow which is <= 0.414

Interpretation of results:

other: not irritating

Conclusions:

The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)was estimated to be not irritating to the skin of New Zealand White rabbits. Based on the estimated result2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)can be considered to be not irritating to skin.

Executive summary:

The dermal irritation potential of2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) was estimated using OECD QSAR toolbox version 3.4 with logPow as the primary descriptor. The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)was estimated to be not irritating to the skin of New Zealand White rabbits. Based on the estimated result2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)can be considered to be not irritating to skin and can be classified under the category ˋ Not Classified’ as per CLP regulation.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

(Q)SAR

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification

Justification for type of information:

Data is from OECD QSAR toolbox version 3.4 and QMRF report has been attached

Qualifier:

according to guideline

Guideline:

other: estimated data

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material (IUPAC name): 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate
- Molecular formula: C9H13NO7S2
- Molecular weight: 311.3337 g/mol
- Smiles notation: COC1=C(C=CC(=C1)S(=O)(=O)CCOS(=O)(=O)O)N
- InChl: 1S/C9H13NO7S2/c1-16-9-6-7(2-3-8(9)10)18(11,12)5-4-17-19(13,14)15/h2-3,6H,4-5,10H2,1H3,(H,13,14,15)
- Substance type: Organic
- Physical state: Solid

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

No data available

Vehicle:

not specified

Controls:

not specified

Amount / concentration applied:

No data available

Duration of treatment / exposure:

single application

Observation period (in vivo):

48 hours

Number of animals or in vitro replicates:

3

Details on study design:

No data available

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

48 h

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No eye irritation was observed.

Estimation method: Takes mode value from the 7 nearest neighbours
Domain  logical expression:Result: In Domain

((((((("a" or "b" or "c" or "d" or "e" or "f" )  and ("g" and ( not "h") )  )  and ("i" and ( not "j") )  )  and ("k" and ( not "l") )  )  and "m" )  and "n" )  and ("o" and "p" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Anilines (Acute toxicity) AND Vinyl Sulfones by US-EPA New Chemical Categories

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Radical AND Radical >> Radical mechanism via ROS formation (indirect) AND Radical >> Radical mechanism via ROS formation (indirect) >> Single-Ring Substituted Primary Aromatic Amines AND SN1 AND SN1 >> Nucleophilic attack after nitrenium ion formation AND SN1 >> Nucleophilic attack after nitrenium ion formation >> Single-Ring Substituted Primary Aromatic Amines by DNA binding by OASIS v.1.4

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Primary aromatic amine by DNA binding by OECD

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as Strong binder, NH2 group by Estrogen Receptor Binding

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as AN2 AND AN2 >> Michael-type addition to quinoid structures  AND AN2 >> Michael-type addition to quinoid structures  >> Substituted Anilines by Protein binding by OASIS v1.4

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Anilines (Unhindered) by Aquatic toxicity classification by ECOSAR

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as Strong binder, NH2 group by Estrogen Receptor Binding

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Moderate binder, NH2 group OR Non binder, impaired OH or NH2 group OR Non binder, MW>500 OR Non binder, non cyclic structure OR Non binder, without OH or NH2 group OR Strong binder, OH group OR Very strong binder, OH group OR Weak binder, NH2 group OR Weak binder, OH group by Estrogen Receptor Binding

Domain logical expression index: "i"

Referential boundary: The target chemical should be classified as SN1 AND SN1 >> Nitrenium Ion formation AND SN1 >> Nitrenium Ion formation >> Primary aromatic amine by DNA binding by OECD

Domain logical expression index: "j"

Referential boundary: The target chemical should be classified as Michael addition OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals OR Michael addition >> P450 Mediated Activation to Quinones and Quinone-type Chemicals >> Hydroquinones OR No alert found OR SN1 >> Nitrenium Ion formation >> Aromatic nitro by DNA binding by OECD

Domain logical expression index: "k"

Referential boundary: The target chemical should be classified as (!Undefined)Group All Lipid Solubility < 0.01 g/kg AND Group All log Kow < -3.1 AND Group All Melting Point > 200 C AND Group CNS log Kow < -2 AND Group CNS Melting Point > 200 C AND Group CNS Melting Point > 50 C by Eye irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "l"

Referential boundary: The target chemical should be classified as (!Undefined)Group CN Lipid Solubility < 0.4 g/kg OR (!Undefined)Group CNHal Lipid Solubility < 400 g/kg OR Group All Aqueous Solubility < 0.000005 g/L OR Group All Aqueous Solubility < 0.00002 g/L OR Group CN Aqueous Solubility < 0.1 g/L OR Group CNHal Aqueous Solubility < 0.004 g/L OR Group CNHal Aqueous Solubility < 0.1 g/L OR Group CNHal log Kow > 3.8 OR Group CNHal Molecular Weight > 370 g/mol OR Group CNS log Kow > 1.5 by Eye irritation/corrosion Exclusion rules by BfR

Domain logical expression index: "m"

Similarity boundary:Target: COc1cc(S(=O)(=O)CCOS(O)(=O)=O)ccc1N
Threshold=20%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "n"

Similarity boundary:Target: COc1cc(S(=O)(=O)CCOS(O)(=O)=O)ccc1N
Threshold=30%,
Dice(Atom centered fragments)
Atom type; Count H attached; Hybridization

Domain logical expression index: "o"

Parametric boundary:The target chemical should have a value of log Kow which is >= -4

Domain logical expression index: "p"

Parametric boundary:The target chemical should have a value of log Kow which is <= 1.87

Interpretation of results:

other: not irritating

Conclusions:

The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)was estimated to be not irritating into the eyes of New Zealand White rabbits. Based on the estimated result2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)can be considered to be not irritating to eye.

Executive summary:

The ocular irritation potential of2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)was estimated using OECD QSAR toolbox version 3.4 with logPow as the primary descriptor. The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)was estimated to be not irritating into the eyes of New Zealand White rabbits. Based on the estimated result2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)can be considered to be not irritating to eye and can be classified under the category ˋ Not Classified’ as per CLP regulation.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin irritation:

Various studies has been investigated for the test chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) to observe the potential for dermal irritation to a greater or lesser extent. The studies are based on in vivo experiments in rabbits for target chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7).The predicted data using the OECD QSAR toolbox and Danish QSAR database has also been compared with the experimental data and summarized as below;

 

In a prediction done by SSS (2017) using the OECD QSAR toolbox with log kow as the primary descriptor, skin irritation potential was estimated for2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0). The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is considered to be not irritating to the skin of rabbits.

 

According to Danish QSAR database , the skin irritation effects were estimated by using four different models i.e, Battery, Leadscope, SciQSAR and CASE Ultra for 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0). Based on estimation, no skin reactions were observed in rabbits. Therefore, 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) was considered to be not irritating.

 

  The above results were supported by the skin irritation studies reported by GREIM H., et.al. (Chemosphere Vol. 28, No. 12, pp. 2203.2236, 1994) and BG Chemie (TOXIKOLOGISCHE BEWERTUNGEN; TOXICOLOGICAL EVALUATION last updated: 06/2000) for two structurally similar read across substances 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7) on 2 New Zealand White rabbits (male and female). In both the studies, the approx. 500 mg of test chemical was applied to the inner surface of the ears of 2 rabbits under an adhesive dressing for 24 hours and observations were made upto 7 days. At the end of the exposure period, the test substance was washed off with water and soap/vegetable oil. No skin irritation was observed after 7 days. Hence the chemicals, 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7) was considered to be non-irritant to rabbit skin.

 

Based on the available data for the target chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7), it can be concluded that chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is not able to cause skin irritation and considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

 

Eye irritation:

In different studies, the test chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) has been investigated to observe the potential for ocular irritation to a greater or lesser extent The studies are based on in vivo experiments in rabbits for target chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7).The predicted data using the OECD QSAR toolbox has also been compared with the experimental data and summarized as below;

 

In a prediction done by SSS (2017) using the OECD QSAR toolbox with log kow as the primary descriptor, ocular irritation potential was estimated for2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0). The substance2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is considered to be not irritating to the eyes of rabbits.

 

 The GREIM H., et.al. (Chemosphere Vol. 28, No. 12, pp. 2203.2236, 1994) and BG Chemie (TOXIKOLOGISCHE BEWERTUNGEN; TOXICOLOGICAL EVALUATION last updated: 06/2000) conducted an eye irritation study for structurally similar read across substance7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) in rabbits. In this study, 50 mg 7-amino-4-hydroxy-2-naphthalenesulfonic acid (I acid) was instilled into the conjunctival sac of 2 animals and each were observed for 7 days. No eye irritation was observed after 7 days. Hence the chemical 7-amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) can be considered non-irritant to rabbit eyes.

 

 

The above result was further supported by another eye irritation study conducted by GREIM H., et.al. (Chemosphere Vol. 28, No. 12, pp. 2203.2236, 1994) and BG Chemie (TOXIKOLOGISCHE BEWERTUNGEN; TOXICOLOGICAL EVALUATION last updated: 06/2000) for structurally similar read across substance6-Amino-4-hydroxy-2-naphthalene-6-sulfonic acidin rabbit. In this test, 50 mg of test chemical was instilled into the conjunctival sac of 2 rabbits. One hour after application, slight reddening was observed, which cleared up completely after 3 days. Hence, the substance 6-Amino-4-hydroxy-2 -naphthalene-6-sulfonic acid was considered to be not irritating to rabbit eyes.

 

Based on the available data for the target chemical2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) and its structurally similar read across substances 7-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 87-02-5) and 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (CAS No: 90-51-7), it can be concluded that chemical2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) (CAS No: 6535-70-2)is not able to cause eye irritation and considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

Justification for classification or non-classification

The skin and eye irritation potential of test chemical2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0)and its structurally similar read across substanceswere observed in various studies. The results obtained from these studies indicate that the chemical 2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) is unlikely to cause skin and eye irritation. Hence2-[(4-amino-3-methoxyphenyl)sulphonyl]ethyl hydrogen sulphate (CAS No: 26672-22-0) can be classified under the category “Not Classified” for skin and eye as per CLP.