61492-48-6
1-(4-ethoxyphenyl)cyclopentane-1-carboxylic acid
→
108098-27-7
(6R,7R)-7-[[1-(4-ethoxyphenyl)cyclopentanecarbonyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid