青霉素V

(2S,5R,6R)-Benzyl 6-Azido-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylate

6β-(3-oxo-3H-isobenzofuran-1-ylideneamino)-penicillanic acid

(2S,5R,6R)-6-(1,3-dioxoisoindol-2-yl)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid

6β-(2-carboxy-benzoylamino)-penicillanic acid