abstract |
ABSTRACT Certain cephalosporin compounds, and their pharmaceu-tically-acceptable salts or in vivo hydrolyzable esters are useful as antibacterial agents. "wherein R1 is lower alkyl substituted by a carboxyl, cyano, halo, hydroxyl or protected carboxyl group; and (A) X is hydroyen or halo and Y is halo, or (B) X is hydrogen and Y is nitro." |