| abstract |
Cephalosporins having a 3-position substituent of the formula: ##STR1## are described, wherein R 5 is hydrogen, alkenyl, alkyl or substituted alkyl, Q is a mono- or bicyclic heterocyclic ring, variously substituted, Y is variously substituted alkylene, Y' represents various linking groups, m and n are independently zero or one, and P is a benzene ring with two ortho groups, one of which is hydroxy or an in-vivo hydrolysable ester thereof and the other is hydroxy, an in vivo hydrolysable ester thereof, carboxy, sulpho, hydroxymethyl, --NHSO 2 CH 3 or --NHCONH 2 ; or P is a particularly substituted pyridone or pyranone. The use of such compounds as antibacterial agents is described, as are processes for their preparation. |