Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-amino-2-phenylacetamido)-3,3-dimethyl-7-oxo-, L- (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[(aminophenylacetyl)amino]-3,3-dimethyl-7-oxo-, [2S-[2a,5a,6b(R*)]]-; L-(+)-Ampicillin; L-Ampicillin