(2,2-Dimethyl-1-oxopropoxy)methyl 3,3-dimethyl-7-oxo-6-(4-oxo-2-butenylidene)-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate (2S-(2alpha,5alpha,6Z(Z)))- (2S-(2alpha,5alpha,6Z(Z)))-(2,2-Dimethyl-1-oxopropoxy)methyl 3,3-dimethyl-7-oxo-6-(4-oxo-2-butenylidene)-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate 142449-95-4 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-6-(4-oxo-2-butenylidene)-, (2,2-dimethyl-1-oxopropoxy)methyl ester, (2S-(2alpha,5alpha,6Z(Z)))- MFAPP Methylene-6-(3-formylallylidene)penicillanate pivalate