(2S,5R,6R)-6-((R)-2-((R)-2-(4-Ethyl-2,3-dioxopiperazine-1-carboxamido)-2-phenylacetamido)-2-phenylacetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid; [(4-ethyl-2,3-dioxopiperazin-1-yl)carbonyl] phenylglycylampicillin; Piperazinedione-carbonyl D-Phenyl-glycylampicillin
