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Intermediates-For Penem & Carbapenem 3-[[(2S,4S)-4-Mercapto-1-(4-nitrobenzyloxy)carbonyl- 2-pyrrolidinyl]-carbonyl]-amino] benzoic acid   CAS No.       : [202467-69-4]   Abbr             : MPBA   Application : Ertapenem   Spec .           : 98.0%