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Intermediates-For Penicillin & Cephalosporin (E,Z)-2-(Benzyloxycarbonylamino-4-thiozoyl)-4-(3-methyl- 2-butenyloxycarbonyl)-2-butenoic acid   CAS No.       : [115065-79-7]   Abbr             : PHE   Application : Ceftibutene   Spec .           : 96.0%