Abstract: Compounds of formula (I) or a pharmaceutically acceptable salt thereof are disclosed: wherein R1 is hydrogen, hydroxy, fluoro, chloro, C1-6alkyl, C3-7cycloalkyl, C3-7cycloalkyloxy, C1-6alkoxy or haloC1-6alkoxy; m is 0 when is a double bond and m is 1 when is a single bond; R2 is hydrogen, halogen, cyano, nitro, C1-6alkyl, C3-7cycloalkyl, C3-7cycloalkyloxy, haloC1-6alkyl, C1-6alkoxy, haloC1-6alkoxy, C1-6alkylthio, amino, mono- or di-C1-6alkylamino or an N-linked 4 to 7 membered heterocyclic group; X is —(CH2—CH2)—, —(CH?CH)—, —(CH2)3—, —C(CH3)2—, —(CH?CH—CH2)—, —(CH2—CH?CH)— or a group —(CHR5)— wherein R5 is hydrogen, halogen, hydroxy, cyano, nitro, C1-6alkyl, C3-7cycloalkyl, C3-7cycloalkyloxy, haloC1-6alkyl, C1-6alkoxy, haloC1-6alkoxy or C1-6alkylthio; R3 is halogen, cyano, C1-6alkyl, C3-7cycloalkyl, C3-7cycloalkyloxy, C1-6alkoxy, C1-6alkylthio, hydroxy, amino, mono- or di-C1-6alkylamino, an N-linked 4 to 7 membered heterocyclic group, nitro, haloC1-6alkyl, haloC1-6alkoxy, aryl, arylC1-6alkyl, ar