Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-[(carboxyphenylacetyl)amino]-3,3-dimethyl-7-oxo-, (2S,5R,6R)- (9CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[(carboxyphenylacetyl)amino]-3,3-dimethyl-7-oxo-, [2S-(2a,5a,6b)]-;Malonamic acid, N-(2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-6-yl)-2-phenyl-(7CI,8CI);(a-Carboxybenzyl)penicillin;6-(a-Carboxyphenylacetamido)penicillanicacid;Carbenicillin;Carboxybenzylpenicillin;Carboxybenzylpenicillin acid;Pyocianil;