| abstract |
Compounds of ** formula **, in which X represents oxygen or sulfur; Y represents - (CR (5) 2) n-; R (1) represents 1. phenyl, which is unsubstituted or substituted with one or two substituents, the same or different, selected from the series consisting of halogen, (C1-C4) alkyl, (C1-C4) alkoxy, -S ( O) m-(C1-C4) alkyl, phenyl, amino, hydroxy, nitro, trifluoromethyl, cyano, hydroxycarbonyl, carbamoyl, (C1-C4) alkoxycarbonyl and formyl. |