Cephalosporin derivatives, processes for their preparation and antibacterial agents

Abstract From the Canadian patent

A compound having the formula: (I), wherein R is a vinyl, phenyl or aralkyl group which may be substituted by at least one substituent selected from the group consisting of an alkyl group having from 1 to 4 carbon atoms a, hydroxyl group, an alkoxy group having from 1 to 4 carbon atoms an acetoxy group, a carboxyl group, a halogen atom and a phenyl group which may be substituted by one or two substituents selected from the group consisting of a hydroxyl group an, acetoxy group, a carboxyl group and a halogen atom; or a pharmaceutically acceptable salt, physiologically hydrolyzable ester or solvate thereof. The compounds are useful as antibacterial agents.