(2S)-2-cis-3-[[4-Mercapto-2-pyrrolidinyl)carbonyl]amino]benzoic acid hydrochloride; The Deprotected Sidechain of Ertapenem; (2S)-cis-3-[[(4-Mercapto-2-pyrrolidinyl)carbonyl]amino]benzoic Acid Monohydrochloride; The Side chain of Ertapenem hydrochloride; (2S,4S)-2-[(3-carboxyphenyl)carbamoyl]-4-sulfanylpyrrolidinium chloride