4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(((((4-butyl-2,3-dioxo-1-piperazinyl)carbonyl)amino)phenylacetyl)amino)-3,3-dimethyl-7-oxo-, (2S-(2-alpha,5-alpha,6-beta(S*)))- 6-(D-(-)-alpha-(4-Butyl-2,3-dioxo-1-piperazinecarboxamido)phenylacetamido)penicillanic acid 65125-89-5 BRN 1065133 T 1221