Synonyms: 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylicacid, 6-(2-chlorohexanamido)-3,3-dimethyl-7-oxo- (7CI,8CI);4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid,6-[(2-chloro-1-oxohexyl)amino]-3,3-dimethyl-7-oxo-, [2S-(2a,5a,6b)]-; Penicillin, (1-chloropentyl)-