Abstract: The present invention provides compounds of formula (I) including stereoisomers, prodrugs and pharmaceutically acceptable salts or solvates thereof wherein R is aryl or heteroaryl and each of the above groups R may be substituted by 1 to 4 groups selected from: halogen, C1-C6 alkyl, C1-C6 alkoxy, halo C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, halo C1-C6 alkoxy, —COR4, nitro, —NR3R4 cyano, or a group R5; R1 is hydrogen, C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, halo C1-C6 alkyl, halo C1-C6 alkoxy, halogen, NR3R4 or cyano; R2 corresponds to a group CHR6R7; R3 is hydrogen, C1-C6 alkyl; R4 independently from R3, has the same meanings; R5 is C3-C7 cycloalkyl, which may contain one or more double bonds; aryl; or a 5-6 membered heterocycle; ?wherein each of the above groups R5 may be substituted by one or more groups selected from: halogen, C1-C6 alkyl, C1-C6 alkoxy, halo C1-C6 alkyl, C2-C6 alkenyl, C2-C6 alkynyl, halo C1-C6 alkoxy, C1-C6 dialkylamino, nitro or cyano; R6 is hydrogen, C2-C6 alkenyl or C1-