115937-29-6 3-Chloro-3',3'-dimethyl-7'-oxo-3-((phenylamino)carbonyl)spiro(oxirane-2,6'-(4)thia(1)azabicyclo(3.2.0)heptane)-2'-carboxylic acid Cpe-penicillin Spiro(oxirane-2,6'-(4)thia(1)azabicyclo(3.2.0)heptane)-2'-carboxylic acid, 3-chloro-3',3'-dimethyl-7'-oxo-3-((phenylamino)carbonyl)-, (2'S-(2'alpha,5'alpha,6'alpha(S*)))-