Chemical identity
Dapsone EP Impurity A / Dapsone Aniline Phenol Impurity
CAS 25963-47-7 · C12H11NO3S
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-11961 |
|---|---|
| PubChem CID | 117686 |
| Name | Dapsone EP Impurity A / Dapsone Aniline Phenol Impurity |
| CAS RN | 25963-47-7 |
| Molecular formula | C12H11NO3S |
| Molecular weight | 249.29 g/mol |
| IUPAC name | 4-(4-aminobenzene-1-sulfonyl)phenol |
| InChIKey | PSHPCZGANRRQDN-UHFFFAOYSA-N |
02Structure identifiers

Structure facts for this exact identity.
| Molecular formula | C12H11NO3S |
|---|---|
| InChIKey | PSHPCZGANRRQDN-UHFFFAOYSA-N |
| Ring count | 2 |
| Defined stereocentres | 0 |
| Unassigned stereocentres | 0 |
| SMILES | C1=CC(=CC=C1N)S(=O)(=O)C2=CC=C(C=C2)O |
|---|---|
| InChI | InChI=1S/C12H11NO3S/c13-9-1-5-11(6-2-9)17(15,16)12-7-3-10(14)4-8-12/h1-8,14H,13H2 |
03India status for this compound
These results apply only to this exact compound name and CAS number. Confirm the current official instruments before making a regulatory decision.
| NDPS / RCS | NOT FOUND IN REVIEWED ENTRIES | CAS 25963-47-7 was not found in the reviewed exact-identity entries. Generic, class, analogue, salt and isomer provisions were not evaluated. |
|---|---|---|
| SCOMET | NOT FOUND IN REVIEWED CAS ENTRIES | CAS 25963-47-7 was not found in the reviewed exact-CAS mapping. Generic and analogue entries were not evaluated. |
- Narcotic Drugs and Psychotropic Substances Act, 1985, ScheduleDepartment of Revenue, Government of India · source version 1985-09-16
- Controlled-substances notifications and amendmentsDepartment of Revenue, Government of India · source version 2026-03-11
- Appendix 3, SCOMET ListDirectorate General of Foreign Trade, Government of India · source version 2024-09-02
04Names and relationships
Associated parent compound
Dapsone
View API and impurity familyOther names
- Dapsone EP Impurity A
- Dapsone Aniline Phenol Impurity
- 4-Amino-4'-hydroxydiphenylsulfone
- 4-[(4-Aminophenyl)sulfonyl]phenol
- p-Sulfanilylphenol
- Phenol, 4-[(4-aminophenyl)sulfonyl]-
- EINECS 247-378-5
- UNII-ZG4J5KE6BM
05Documented history
Dated discovery, occurrence, use and issue claims are published only when a suitable primary or government source is available.
No verified discovery, first report, occurrence, use or issue event is currently available for this identity.
06Sources
- S01PubChem compound record, CID 117686
Names and machine-readable chemical identity properties.
- S02NCBI website and molecular data policies
Reuse policy for NCBI molecular data. This page does not reproduce vendor descriptions or contributed narrative text.
- S03Narcotic Drugs and Psychotropic Substances Act, 1985, Schedule
Department of Revenue, Government of India. Used for the exact-compound India status shown on this page.
- S04Controlled-substances notifications and amendments
Department of Revenue, Government of India. Used for the exact-compound India status shown on this page.
- S05Appendix 3, SCOMET List
Directorate General of Foreign Trade, Government of India. Used for the exact-compound India status shown on this page.
