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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

Cefmetazole (Free acid) | CAS 56796-20-4

A cephamycin free acid with a nitrile-bearing sulfur side chain and an N-methyltetrazole substituent, requiring structure-specific impurity review in analytical and active-material qualification.

CAS56796-20-4
Molecular formulaC15H17N7O5S3
Molecular weight471.5 g/mol

Product overview

Cefmetazole carries a 7α-methoxy cephamycin core together with cyanomethylthioacetyl and N-methyltetrazolylthiomethyl groups. This combination distinguishes it from other methoxy-substituted beta-lactams. The catalogue CAS identifies the free acid; sodium-containing material requires separate form confirmation. For purchasing, connect the complete side-chain identity to the proposed related-substance method rather than qualifying solely through a generic beta-lactam purity value.

Chemical identity

Chemical name
Cefmetazole (Free acid)
CAS number
56796-20-4
Molecular formula
C15H17N7O5S3
Molecular weight
471.5 g/mol

Application context

Cefmetazole belongs to the cephamycin antibacterial family and is relevant to chemical characterization and development of cefmetazole-related active material. An analytical programme can examine the intact beta-lactam, stereochemical identity and impurities associated with its two sulfur-containing side chains. Where material is intended for pharmaceutical manufacture, define the selected manufacturer, chemical form and applicable qualification package. A research reagent, a quantitative analytical standard and a released API batch may require different evidence even when they share the same molecular structure.

Chemistry and synthetic role

The nitrile group lies on the cyanomethylthioacetyl side chain; the tetrazole ring is a separate N-methyl-containing substituent at the other end of the cephem framework.

Quality review

Complete side-chain identity

Confirm both the nitrile-containing acyl group and the N-methyltetrazole substituent with appropriate structural data.

Intact beta-lactam profile

Review a stability-indicating method that resolves relevant degradants and side-chain-related species.

Free-acid content basis

State water correction, counterion assessment and the quantitative assay basis required for the intended material role.

Preparing a specification

Specify cefmetazole free acid, quantitative assay basis, water, counterions and a related-substance method addressing beta-lactam and side-chain integrity.

Packaging and storage

Confirm container compatibility, closure and net weight for the selected grade and destination. Follow the actual supplier SDS and batch label for storage and transport.

Documentation

Request the batch COA, SDS and analytical methods covering the agreed purchasing specification. Confirm which supporting chromatograms and application-specific records are available from the selected manufacturer.

Procurement questions

Is this the sodium salt of cefmetazole?

The listed formula and CAS describe the free acid; specify a sodium form separately if required.

Why review both side chains?

Their distinct nitrile and tetrazole features help differentiate cefmetazole and its related species.

Can an HPLC area result replace a quantitative standard value?

No. Quantitative use requires an appropriate assigned content and documented basis.

Technical sources
  1. PubChem CAS identity lookupNCBI / PubChem
  2. Cefmetazole substance identityFDA GSRS
  3. Cefmetazole safety data sheetSanta Cruz Biotechnology
  4. CefmetazolePubChem