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Intermediates-For Penicillin & Cephalosporin 7-Phenyl acetamido-3-Hydroxy-3-Cephem-4-Carboxylic acid Diphenylmethyl ester   CAS No.       : [54639-48-4]   Abbr             : GHYH (3-OH, GOH)   Application : Ceftizoxime   Spec .           : 99.0%