Syonyms Name: Side chain for penipenem; (S)-[1-(3-mercapto-1-pyrrolidinyl)-ethylidene]-(4-nitrophenyl)methylester,carbamicacid; S-(1-(1-((((4-nitrobenzyl)oxy)carbonyl)imino)ethyl)pyrrolidin-3-yl) ethanethioate 4-Nitrobenzyl-1-((S)-3-mercaptopyrrolidin-1-yl)ethylidenec