Sultamicillin EP Impurity C (Ampicillin, Piperacillin EP Impurity A)

(2S,5R)-(((2S,5R)-3,3-dimethyl-4,4-dioxido-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methyl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide

(((2R,4S)-2-(1-((R)-2-amino-2-phenylacetamido)-2-(((1R)-2-(((2S,5R,6R)-2-((((3,3-dimethyl-4,4-dioxido-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methoxy)carbonyl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl)amino)-2-oxo-1-phenylethyl)amino)-2-oxoethyl)-5,5-dimethylthiazolidine-4-carbonyl)oxy)methyl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide

(((2S,5R,6R)-3,3-dimethyl-7-oxo-6-((R)-2-((E)-(5-oxohexan-2-ylidene)amino)-2-phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methyl 3,3-dimethyl-7-oxo-4-oxa-1-azabicyclo[3.2.0]heptane-2-carboxylate

(((2S,5R,6R)-6-((R)-2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl)oxy)methyl 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 4,4-dioxide