| 摘要 |
PCT No. PCT/GB93/00457 Sec. 371 Date Sep. 6, 1994 Sec. 102(e) Date Sep. 6, 1994 PCT Filed Mar. 4, 1993 PCT Pub. No. WO93/18044 PCT Pub. Date Sep. 16, 1993 <IMAGE> (I) Compounds of formula (I) or salts thereof: wherein R1 is hydrogen, methoxy or formamido; R2 is an acyl group; CO2R3 is a carboxy group or a carboxylate anion, or R3 is a readily removable carboxy protecting group or a pharmaceutically acceptable salt-forming group or in vivo hydrolysable ester group; R4, R5, R6 and R7 independently represent hydrogen or a bond or a substituent group or may form a cyclic system. These compounds have antibacterial activity. |
