1 0JM (2s,5r,6r,7r)-6-{[(2r)-2-carboxy-2-phenylacetyl]amino}-7-hydroxy-3,3-dimethyl-4-thia-1-azabicyclo[3.2.0]heptane-2-carbo xylic acid 1.000 2 PNN Penicillin G 0.885 3 AIC (2s,5r,6r)-6-{[(2r)-2-amino-2-phenylethanoyl]amino}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 0.852 4 PN1 (2s,6r)-6-{[(2r)-2-amino-2-phenylethanoyl]amino}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 0.852 5 SOX N-[(2s,4s,6r)-2-(dihydroxymethyl)-4-hydroxy-3,3-dimethyl-7-oxo-4lambda~4~-thia-1-azabicyclo[3.2.0]hept-6-yl]-2-phenylacetamide 0.852