Cephalosporin derivatives

摘要

A compound having the formula: <IMAGE> (I) <IMAGE> wherein R1 is a straight chain, branched chain or cyclic lower alkyl group which may be substituted by a carboxyl group, and each of R2 and R3 which may be the same or different, is a hydrogen atom, a hydroxyl group, a methoxy group or an acetoxy group, and R4 is a hydroxyl group, a methoxy group or an acetoxy group; or a pharmaceutically acceptable salt, physiologically hydrolyzable ester or solvate thereof.