Chemical identity
Sulfamethoxazole EP Impurity C / Sulfamethoxazole Related Compund C
CAS 1072-67-9 · C4H6N2O
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-28572 |
|---|---|
| PubChem CID | 66172 |
| Name | Sulfamethoxazole EP Impurity C / Sulfamethoxazole Related Compund C |
| CAS RN | 1072-67-9 |
| Molecular formula | C4H6N2O |
| Molecular weight | 98.1 g/mol |
| IUPAC name | 5-Methylisoxazol-3-amine |
| InChIKey | FKPXGNGUVSHWQQ-UHFFFAOYSA-N |
02Structure identifiers

The parsed structure contains 1 ring, includes aromatic atoms, includes aliphatic carbon. These statements are calculated from the published structure string.
| Defined stereocentres | 0 |
|---|---|
| Unassigned stereocentres | 0 |
| Ring count | 1 |
| Secondary amines | 0 |
| Tertiary amines | 0 |
| N-methyl amine sites | 0 |
| SMILES | CC1=CC(=NO1)N |
|---|---|
| InChI | Not listed |
| Formula from structure | C4H6N2O |
| Molecular weight from structure | 98.1 g/mol |
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 | NO EXACT MATCH FOUND | CAS 1072-67-9 has no exact match in the reviewed published schedule. |
|---|---|---|
| SCOMET | NO EXACT REVIEWED CAS MATCH | CAS 1072-67-9 has no exact match in the reviewed SCOMET list. |
| Review date | 2026-08-01 | Recheck the current official instruments for the material, concentration, activity and date in question. |
- Narcotic Drugs and Psychotropic Substances Act, 1985, ScheduleDepartment of Revenue, Government of India · reviewed 2026-08-01
- Controlled-substances notifications and amendmentsDepartment of Revenue, Government of India · reviewed 2026-08-01
- Appendix 3, SCOMET ListDirectorate General of Foreign Trade, Government of India · reviewed 2026-08-01
04Names and relationships
Associated parent compound
Sulfamethoxazole
View API and impurity familyOther names
- Sulfamethoxazole EP Impurity C
- 5-Methyl-3-isoxazolamine
- 5-Methyl-1, 2-oxazol-3-amine
- 5-Methyl-3-aminoisoxazole
- 5-Methyl-3-isoxazolylamine
- NSC 159134
- 3-Amino-5-methylisoxazole
- 1072-67-9
- 3-Isoxazolamine, 5-methyl-
- Isoxazole, 3-amino-5-methyl-
- DTXSID9021631
- G54MJS11L9
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 66172
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.
