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Intermediates-For Penem & Carbapenem 4-Nitrobenzyl(2S,4S)-4-acetylthio-2-[[N-sulfamoyl-N- (tert-butoxycarbonyl)amino]methyl]pyrrolidine-1-carboxylate   CAS No.       :[491878-06-9]   Abbr             : ASPC   Application :  Doripenem   Spec .           :96.0%