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Intermediates-For Penem & Carbapenem (2S,4S)-2-Dimethylaminocarboxyl-4-mercapto- 1-p-nitrobenzyloxycarbonyl-pyrrolidine   CAS No.       : [96034-64-9]   Abbr             : 2S CIS   Application :  Meropenem   Spec .           : 97.0%