Chemical identity
Cefazolin EP Impurity E
CAS 29490-19-5 · C3H4N2S2
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-09758 |
|---|---|
| PubChem CID | 1810203 |
| Name | Cefazolin EP Impurity E |
| CAS RN | 29490-19-5 |
| Molecular formula | C3H4N2S2 |
| Molecular weight | 132.21 g/mol |
| IUPAC name | 5-Methyl-1,3,4-thiadiazol-2-thiol |
| InChIKey | FPVUWZFFEGYCGB-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=NNC(=S)S1 |
|---|---|
| InChI | Not listed |
| Formula from structure | C3H4N2S2 |
| Molecular weight from structure | 132.21 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 29490-19-5 has no exact match in the reviewed published schedule. |
|---|---|---|
| SCOMET | NO EXACT REVIEWED CAS MATCH | CAS 29490-19-5 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
Cefazolin
View API and impurity familyOther names
- 5- Methyl-1, 3, 4-thiol
- 2-Mercapto-5-methyl-1,3,4-thiadiazole
- 2-Methyl-1,3,4-thiadiazol-5-thiol
- 5-Methyl-2-sulfanyl-1,3,4-thiadiazole
- 5-Methyl-3H-1,3,4-thiadiazole-2-thione
- 5-Methyl-2-mercapto-1,3,4-thiadiazole
- Methylthiadiazole thiol
- 5-Methyl-1,3,4-thiadiazole-2-thiol (USP)
- 29490-19-5
- 5-Methyl-1,3,4-thiadiazole-2-thiol
- 5-Methyl-1,3,4-thiadiazole-2(3H)-thione
- 9JY8UF0TSS
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 1810203
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.
