Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2'-carboxy-2-biphenylcarboxamido)-3,3-dimethyl-7-oxo- (8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[[(2'-carboxy[1,1'-biphenyl]-2-yl)carbonyl]amino]-3,3-dimethyl-7-oxo-, [2S-(2a,5a,6b)]-