7K hanna JM,H anda V K,Dandala R,et al. Process for preparing cephalosporin antibiotics [ P]. US:5869649,1999-02-09.
8Deshpande P B,Luthra P K. Thioester derivatives of thiazolyLacetic acid and their use in the preparation of cephalosporincompoundsp[P]. US:6388070,2002-05-14.
9Kenzo N,Kazuo T,Haruo S. Solid cephalosporin saltp[P]. JP:51104583,1976-08-29.
10Ray U K,Srinivasulu B,Sivakumaran M. Preparation of7-amino-3-[(5-methyl-1,3,4-thiadiazol)]-3-cephem-4-car-boxylic acid[P]. IN:2003CH00606,2006-09-22.
