| abstract |
A compound of formula (I) or a stereoisomeric form thereof, in which R 1 is C 1-6 alkyl optionally substituted with one or more substituents each independently selected from the group consisting of halo, C 1-4 alkyloxy, C 3- cycloalkyl 7, tetrahydropyranyl, tetrahydrofuranyl and phenyl; C3-7 cycloalkyl; tetrahydropyranyl, tetrahydrofuranyl, 1,3-benzodioxolyl or phenyl; wherein each independent phenyl is optionally substituted with one or more substituents each independently selected from the group consisting of halo, cyano, C1-4 alkyl optionally substituted with one or more halo substituents and C1-4 alkyloxy optionally substituted with one or more halo substituents; R2 is hydrogen, cyano or C1-4 alkyl optionally substituted with one or more substituents independently each selected from the group consisting of C1-4 alkyloxy, halo and NR3R4; X1 is CH or N; X2 is CR5 or N; R5 is hydrogen, halo, cyano, C1-4 alkyloxy or C1-4 alkyl optionally substituted with one or more substituents independently each selected from the group consisting of halo, C1-4 alkyloxy and NR3R4; X3 is CR6 or N; R6 is hydrogen, halo, cyano, C1-4 alkyloxy or C1-4 alkyl optionally substituted with one or more substituents each independently selected from the group consisting of halo, C1-4 alkyloxy and NR3R4. |