Novel compounds

A compound of formula (I)

• where:
• Het is a heteroaryl group selected from the group consisting of pyridinyl, pyrimidinyl, pyridazinyl or pyrazinyl, said heteroaryl group being optionally substituted with 1, 2 or 3 substituents independently selected from the group consisting of:
• C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy and cyano;
• R1 is C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy, cyano, C1-4alkylSO2, C3-8cycloalkylSO2, C3-8cycloalkylCH2SO2, phenyl or a 5 or 6 membered heterocyclyl group containing 1, 2 or 3 atoms selected from N, O or S, which phenyl or heterocyclyl group is optionally substituted with C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy or cyano;
• R2 is C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy, cyano, phenyl or a 5 or 6 membered heterocyclyl group containing 1, 2 or 3 atoms selected from N, O or S, which phenyl or heterocyclyl group is optionally substituted with C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy or cyano;
• R3 is C1-4alkyl, halo, C1-4alkoxy, haloC1-4alkyl, haloC1-4alkoxy or cyano;
• m is 0 or 1;
• and
• n is 0 or 1;
• or a pharmaceutically acceptable salt thereof.