(5aR-cis)-2-[(Cyanomethyl)thio]-N-(1,4,5a,6-tetrahydro-6-methoxy-1,7-dioxo-3H,7H-azeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl)-acetamide ; CAS # 70993-70-3 ;

(6R-cis)-7-[[[(Cyanomethyl)thio]acetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-7-(methylthio)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid ; CAS # 68576-47-6 ;

Cefmetazole Acid Sodium Salt ; CAS # 56796-39-5 ;