6α-[[(R)-2-Amino-2-(1,4-cyclohexadien-1-yl)acetyl]amino]penicillanic acid

4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylicacid,6-(2-amino-2-(1,4-cyclohex

(2S,5β)-6α-[[(R)-Amino(1,4-cyclohexadien-1-yl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2β-carboxylic acid