Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-biphenylcarboxamido)-3,3-dimethyl-7-oxo- (7CI,8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[([1,1'-biphenyl]-2-ylcarbonyl)amino]-3,3-dimethyl-7-oxo-, [2S-(2a,5a,6b)]-; 2-Biphenylpenicillin; Ancillin; Biphenicillin; Diphenicillin;Penicillin, ([1,1'-biphenyl]-2-yl)-; SKF 12141; [2S-(2a,5a,6b)]-6-[[1,1'-Biphenyl]-2-ylformamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid