
Chemical identity
Cefazolin 3-Hydroxymethyl Impurity
CAS 478494-71-2 · C11H12N6O5S
01Identity
Identifiers and names for this exact compound. Empty fields are left unassigned.
| Lazychem ID | LC-09752 |
|---|---|
| PubChem CID | 124584303 |
| Name | Cefazolin 3-Hydroxymethyl Impurity |
| CAS RN | 478494-71-2 |
| Molecular formula | C11H12N6O5S |
| Molecular weight | 340.3 g/mol |
| IUPAC name | (6R,7R)-7-(2-(1H-Tetrazol-1-yl)acetamido)-3-(hydroxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid |
| InChIKey | YGQTUWKIILQPEL-GMSGAONNSA-N |
02Structure identifiers

Structure facts for this exact identity.
| Molecular formula | C11H12N6O5S |
|---|---|
| InChIKey | YGQTUWKIILQPEL-GMSGAONNSA-N |
| Ring count | 3 |
| Defined stereocentres | 2 |
| Unassigned stereocentres | 0 |
| SMILES | C1C(=C(N2[C@H](S1)[C@@H](C2=O)NC(=O)CN3C=NN=N3)C(=O)O)CO |
|---|---|
| InChI | InChI=1S/C11H12N6O5S/c18-2-5-3-23-10-7(9(20)17(10)8(5)11(21)22)13-6(19)1-16-4-12-14-15-16/h4,7,10,18H,1-3H2,(H,13,19)(H,21,22)/t7-,10-/m1/s1 |
03Stereochemistry
The published structure contains 2 defined and 0 unassigned tetrahedral stereocentres. The exact wedge-and-dash depiction is shown above.
Published same-connectivity configurations
1 recordThese records have the same connectivity, molecular formula and protonation layer, but a different complete InChIKey stereochemical layer. Only separately structure-linked records are shown.

No additional structure-linked configuration with the same connectivity is currently present in the LazyChem dataset.
Scope: The mathematical 2^n value is only an upper bound. Symmetry and other stereogenic elements can change the number of distinct stereoisomers. A hypothetical configuration is not published as a compound record without a verified structure identity.
04India 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 478494-71-2 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 478494-71-2 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
05Names and relationships
Associated parent compound
Cefazolin
View API and impurity familyOther names
- Cefazolin 3-hydroxymethyl
- Des[(5-methyl-1,3,4-thiadiazol-2-yl)thio] Cefazolin-3-methanol
- (6R,7R)-3-(Hydroxymethyl)-8-oxo-7-[[2-(tetrazol-1-yl)acetyl]amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
- (6R,7R)-3-(Hydroxymethyl)-8-oxo-7-((2-(1H-tetrazol-1-yl)acetyl)amino)-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid
- (6R,7R)-7-(2-(1H-Tetrazol-1-yl)acetamido)-3-(hydroxymethyl)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid
- 5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 3-(hydroxymethyl)-8-oxo-7-((2-(1H-tetrazol-1-yl)acetyl)amino)-, (6R,7R)-
- UNII-WK7TY2EQP9
- Cefazolin Impurity 11Cefazolin USP Impurity E
06Documented 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.
07Sources
- S01PubChem compound record, CID 124584303
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.
