| abstract |
Novel compounds of general formula (I> <IMAGE> wherein R is a C1-C4 alkyl group or a C3-C6 cycloalkyl group; R' and R'', which may be the same or different, are selected from hydrogen, halogen atoms, methyl, trifluoromethyl or methoxy groups; X and Y, which may be the same or different, are selected from a nitrogen atom, <IMAGE> and pharmaceutically acceptable base addition salts thereof, have a strong antibacterial activity. |