Abstract: The present invention relates to novel compounds of formula (I) or a pharmaceutically acceptable salt thereof, wherein Ar is phenyl, naphthyl, a monocyclic heteroaromatic group or a bicyclic heteroaromatic group, said Ar group being optionally substituted by 1-4 substituents, which may be the same or different, and which are selected from the group consisting of: halogen, hydroxy, cyano, nitro, trifluoromethyl, trifluoromethoxy, C1-6alkyl, trifluoromethanesulfonyloxy, pentafluoroethyl, C1-6alkoxy, arylC1-6alkoxy, C1-6alkylthio, C1-6alkoxyC1-6-alkyl, C3-7cycloalkylC1-6alkoxy, C1-6alkanoyl, C1-6alkoxycarbonyl, C1-6alkylsulfonyl, C1-6alkylsulfinyl, C1-6alkylsulfonyloxy, C1-6alkylsulfonylC1-6alkyl, arylsulfonyl, arylsulfonyloxy, arylsulfonylC1-6alkyl, C1-6alkylsulfonamido, C1-6alkylamido, C1-6alkylsulfonamidoC1-6alkyl, C1-6alkylamidoC1-6alkyl, arylsulfonamido, arylcarboxamido, alkylsulfonamidoC1-6alkyl, arylcarboxamidoC1-6alkyl, aroyl, arolC1-6alkyl, arylC1-6alkanoyl, a group R<3>OCO(CH2)s, R<3>CON(R&

Abstract: The present invention relates to novel compounds of formula (1) or a pharmaceutically acceptable salt thereof, wherein Ar is phenyl, naphthyl, a monocyclic heteroaromatic group or a bicyclic heteroaromatic group, said Ar group being optionally substituted by 1-4 substituents, which may be the same or different, and which are selected from the group consisting of: halogen, hydroxy, cyano, nitro, trifluoromethyl, trifluoromethoxy, C1-6alkyl, trifluoromethanesulfonyloxy, pentafluoroethyl, C1-6alkoxy, arylC1-6alkoxy, C1-6alkylthio, C1-6alkoxyC1-6-alkyl, C3-7cycloalkylC1-6alkoxy, C1-6alkanoyl, C1-6alkoxycarbonyl, C1-6alkylsulfonyl, C1-6alkylsulfinyl, C1-6alkylsulfonyloxy, C1-6alkylsulfonylC1-6alkyl, arylsulfonyl, arylsulfonyloxy, arylsulfonylC1-6alkyl, C1-6alkylsulfonamido, C1-6alkylamido, C1-6alkylsulfonamidoC1-6alkyl, C1-6alkylamidoC1-6alkyl, arylsulfonamido, arylcarboxamido, arylsullonamidoC1-6alkyl, arylcarboxamidoC1-6alkyl, aroyl, arylC1-6alkyl, arylC1-6alkanoyl, a group R3OCO(CH2)s, R3CON(R4)(CH2)s, R3R4NCO(