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Intermediates-For Penicillin & Cephalosporin 7-Amino-3-Vinyl-3-cephem-4-carboxylic acid diphenylmethyl ester .HCl   CAS No.       : [79349-67-0]   Abbr             : 7-AVCE   Application : Cefixime / Cefdinir   Spec .           : 98.0%