| abstract |
Analogous compounds of cephalosporins of the formulan n wherein R' is amino or a substituted amino, R 2 is hydrogen or lower alkoxy, or R' and R 2 are combined together to form a group of the formula:n wherein R 6 and R 7 are each hydrogen or lower alkyl, and A is a group of the formula:n wherein X is -S- orn n R 3 is carboxy or a protected carboxy group and R 4 is hydrogen, hydroxy or acyl, and pharmaceutically acceptable salt thereof and process for their preparation, and also a pharmaceutical composition comprising, as an effective ingredient, the above compound in association with a pharmaceutically acceptable, substantially non-toxic carrier or excipient. The invention also relates to the starting compoundsn and their preparation. |