| abstract |
The invention relates to compounds of general formula (I) or to salts of these compounds. In the formula, R1 represents hydrogen, methoxy or formamido, R2 represents an acyl group; CO2R3 represents a carboxy group or a carboxylate anion, or R3 represents an easily separable protective carboxy group or a group forming pharmaceutically acceptable salts or a group of esters hydrolysable in vivo; R4, R5, R6 and R7 independently represent hydrogen or a bond or a substitution group or can constitute a ring system. The compounds exhibit antibacterial activity. |