Ceftazidime Δ2-Impurity ; (2RS,6R,7R)-7-[[(2Z)-2-(2-Aminothiazol-4-yl)-2-[(1-carboxy-1-methylethoxy) imino]acetyl]amino]-8-oxo-3-[(1-pyridinio)methyl]-5-thia-1-azabicyclo[4.2.0] oct-3-ene-2-carboxylate ; CAS # 1000980-60-8 ;

Ceftazidime (2E)-Isomer ; (6R,7R)-7-[[(2E)-2-(2-Aminothiazol-4-yl)-2-[(1-carboxy-1-methylethoxy) imino] acetyl]amino]-8-oxo-3-[(1-pyridinio)methyl]-5-thia-1-azabicyclo [4.2.0]oct-2-ene-2-carboxylate ; CAS # 97148-38-4 ;

(6R,7R)-7-Amino-8-oxo-3-[(1-pyridinio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate hydroiodide ; CAS # 3432-88-0 (Inner salt) ; 100988-63-4 (HI salt) ;

Ceftazidime t-Butyl Ester ; (6R,7R)-7-[[(2Z)-2-(2-Aminothiazol-4-yl)-2-[[2-(1,1-dimethylethoxy)-1,1-dimethyl-2-oxoethoxy]imino]acetyl]amino]-8-oxo-3-[(1-pyridinio) methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate ; CAS # 102772-66-7 ;

2-[[[(1Z)-1-(2-Aminothiazol-4-yl)-2-[(oxoethyl)amino]-2-oxoethylidene] amino] oxy]-2-methylpropanoic acid ; CAS # 194241-83-3 ;

Ceftazidime Methyl Ester ; (6R,7R)-7-[[(2Z)-2-(2-Aminothiazol-4-yl)-2-[(2-methoxy-1,1-dimethyl-2-oxoethoxy)imino]acetyl]amino]-8-oxo-3-[(1-pyridinio)methyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate ; CAS # 1354396-23-8 ;

(Z)-2-(((1-(2-Aminothiazol-4-yl)-2-((2-hydroxy-2-sulfonatoethyl)amino)-2-oxoethylidene)amino)oxy)-2-methylpropanoate disodium salt ;

1-[[(6R,7R)-7-[[(2Z)-(2-Amino-4-thiazolyl)[(1-carboxy-1-methylethoxy) imino]acetyl]amino]-2-carboxy-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-en-3-yl]methyl]pyridinium inner salt pentahydrate ; CAS # 78439-06-2 (pentahydrate) ; 120618-65-7 (x hydrate) ; 72558