CAS 56796-20-4 appears in our catalog under these names: Cefmetazole, >95% (HPLC), Cefmetazole, Cefmetazole , (6R,7S)-7-(2-((Cyanomethyl)thio)acetamido)-7-methoxy-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 97%, 97%, Cefmetazole, 99.84%. Offered by: TRC, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar), Chemat. Available pack sizes: 10mg, 50mg, 5mg, 25mg, 100mg, 5g, 25g, 100g.