(6R,7R)-7-AMINO-3-[[(1,3,4-THIADIAZOL-5-YL)THIO]METHYL]-3-CEPHEM-4-CARBOXYLIC ACID, (6R-trans)-7-amino-8-oxo-3-[(1,3,4-thiadiazol-2-ylthio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, Ceftezole Impurity 3
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