Ceftazidime ep impurity B97148-38-431 % similar 5-(1,1-Dimethylethyl) hydrogen L-glutamate2419-56-931 % similar H-D-Glu(otbu)-oh45125-00-631 % similar 2-(2-Aminothiazol-4-yl) acetic acid hydrochloride66659-20-931 % similar Glycine tert-butyl ester hydrochloride27532-96-331 % similar 3-(tert-Butoxy)-3-oxopropanoic acid40052-13-931 % similar Maem84994-24-131 % similar Mono-tert-butyl succinate15026-17-230 % similar tert-Butyl 2-hydroxyacetate50595-15-830 % similar