118-53-6 2-Pentenylpenicillin 3,3-Dimethyl-6-(3-hexenamido)-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 3,3-dimethyl-6-(3-hexenamido)-7-oxo- Flavicidin Penicillin F Penicillin I delta(sup 2)-Pentenylpenicillin delta-beta,gamma-Pentenylpenicillin