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Intermediates-For Penem & Carbapenem PNB(4R,5S,6S)-3-(Diphenyloxy)phosphoryloxy-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3,2,0]hept-2-ene-2-carboxylate   CAS No.       : [90776-59-3]   Abbr             : MAP   Application :  Meropenem   Spec .           : 97.0%