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Intermediates-For Penicillin & Cephalosporin (6R,7R )-7-Amimo-8-oxo-3-(1-propenyl)-5-thia-1-azabicylo-[4.2.0]oct-2-ene-2-carboxylic acid   CAS No.       : [120709-09-3]   Abbr             : 7-APRA   Application : Cefprozil   Spec .           : 96.0%