https://es.maxmedchem.com/3-2s-4s-4-mercapto-1-4-nitrobenyloxi-carbonil-2-pirrolidinil-carbonil-amino-acido-benzoico-pd44869073.html
3-[[[(2S, 4S) -4-Mercapto-1- (4-nitrobenyloxi) carbonil-2-pirrolidinil] carbonil] amino] ácido benzoico