penicillin X

Penicillin III

4-Hydroxybenzylpenicillin

6α-[(4-Hydroxyphenyl)acetylamino]penicillanic acid

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