| 摘要 |
This invention relates to novel cephem compounds of high antimicrobial activity, to processes for preparation of said compounds, and to pharmaceutical compositions comprising said compounds, the novel cephem compounds being of the formula: <IMAGE> wherein R1 is amino or a protected amino group; R2 is hydrogen, lower aliphatic hydrocarbon group which may be substituted with a substituent selected from the group consisting of carboxy and protected carboxy, cyclo (lower) alkyl or cyclo (lower) alkenyl; and R3 is a thiazolio group which may be substituted with a substituent selected from the group consisting of lower alkyl and hydroxy (lower) alkyl, or a pyridinio group substituted with a substituent selected from the group consisting of halogen, cyano, hydroxy, amino, acylamino, lower alkanoyl, hydroxycarbamoyl, alkylcarbamoyl, carboxy, protected carboxy, lower alkyl, hydroxy (lower) alkyl, sulfo (lower) alkyl, protected amino (lower) alkyl, amino (lower) alkyl, carboxy (lower) alkyl and hydroxyimino (lower) alkyl; and pharmaceutically acceptable salts thereof.
|
