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The synthesis and antibacterial activity of a series of beta-lactamase stable, broad spectrum 7-[2-(2-amino-thiazol-4-yl)-2-(Z)-(methoxyimino)acetamido]-cephalo sporins, characterised by a C-3-[N-(substituted-amino)pyridinium-4-thiomethyl] group, is described. Gram-positive and Gram-negative bacteria including extended spectrum beta-lactamase-producing strains were most susceptible to the N-amino- and N-methylamino derivatives (3a) and (3b); with the exception of Pseudomonas aeruginosa, (3b) was more active in vitro and in vivo than cefpirome or ceftazidime.

journal of antibiotics

Synthesis and biological properties of some 3-((N-subtstituted-amino)pyridinium-4-thiomethyl)-7-((2-amino-thiazol-4-yl)-2-(Z)-(methoxyimino)acetamido)ceph-3-em-4-carboxylates.