(2S,5R,6R)-6-[(4R)-2,2-dimethyl-5-oxo-4-phenylimidazolidin-1-yl]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2S,5R,6R)-6-[(4R)-2,2-dimethyl-5-oxo-4-phenyl-imidazolidin-1-yl]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2S,5R,6R)-6-[(4R)-2,2-dimethyl-5-oxo-4-phenyl-1-imidazolidinyl]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2S,5R,6R)-7-keto-6-[(4R)-5-keto-2,2-dimethyl-4-phenyl-imidazolidin-1-yl]-3,3-dimethyl-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 3511-16-8 D01074 Hetacillin (USAN/INN) Versapen Versapen (TN) C11729 Hetacillin