4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-amino-3,3-dimethyl-7-oxo- 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-amino-3,3-dimethyl-7-oxo-, [2S-(2.alpha.,5.alpha.,6.beta.)]- 551-16-6 6-APA 6-APS 6-Aminopenicillanic acid NSC50071 Penicin Penin Phenacyl 6-aminopenicillinate WLN: T45 ANV ESTJ CZ F1 F1 GVQ