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The synthesis and antimicrobial activity of novel carbacephem antibiotics which have amido moiety of (S)-aminothiazolylglycyl side chain are described. Among them, the compound having 5-hydroxy-4-pyridon-2-carboxyl group (KT-4697) showed exceptionally strong activity against Pseudomonas aeruginosa as well as Gram-negative bacteria. A cephalosporin with this acyl group namely KT-4788 with methylpyridiniumthiomethyl group at C-3 was found to be the most active against Gram-positive and Gram-negative strains including P. aeruginosa.

journal of antibiotics

Aminothiazolylglycyl derivatives of carbacephem antibiotics. II Synthesis and antibacterial activity of novel aminothiazolyl cephem compounds with hydroxypyridone moiety.