| 摘要 |
This invention relates to new cephem compounds of antimicrobial activity, 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 suitable substituent(s), cyclo(lower)alkyl or cyclo(lower)alkenyl; and R3 is thiazolio group which may be substituted with suitable substituent(s) or a pyridinio group substituted with substituent(s) 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.
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