1	A14	(1s,4s,5s,7r)-7-{[(5s)-5-amino-5-carboxypentanoyl]amino}-3,3-dimethyl-6-oxo-2-thiabicyclo[3.2.0]heptane-4-carboxylic acid	1.000
2	IP1	Isopenicillin N	0.920
3	APV	6-(5-amino-5-carboxy-pentanoylamino)-3-hydroxymethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid	0.846