Piperacillin EP Impurity B

Chemical Name: (2Ξ,4S)-2-[(Ξ)-carboxy[(2R)-2-(4-ethyl-2,3-dioxopiperazine-1-carboxamido)-2-phenylacetamido]methyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid (as per EP); (2R,4S)-2-{(1R)-Carboxy[2-(4-ethyl-2,3-dioxopiperazine-1-carboxamido)-2-phenylacetamido]methyl}-5,5-dimethylthiazolidine-4-carboxylic acid (as per USP)

Synonym: Isopilocarpine nitric acid