Patent ID: 8557992

Claim:
A compound of formula (I): or a pharmaceutically acceptable salt thereof, wherein X represents —CH, or —O; R represents C 6-10 aryl or C 5-10 heterocyclyl; wherein said aryl and heterocyclyl is optionally substituted with one or more of R X R X represents: (a) halogen, (b) hydroxy, (c) —O—C 1-6 alkyl, said alkyl optionally substituted with 1 to 3 groups of halo; (d) —C 1-6 alkyl, said alkyl optionally substituted with 1 to 3 groups of halo; (e) cyano, (f) NR A R B (g) —C(═O)—R C , (h) —S(O) n —R C ; or (i) C5-10 heterocyclyl, said heterocyclyl optionally substituted with 1 to 3 groups of R C ; R A and R B are independently selected from the group consisting of (i) hydrogen, (ii) —C 1-6 alkyl, or R A and R B are linked together with the nitrogen to which they are both attached to form a 2-6 membered carbocyclic ring, wherein one or two of the ring carbon atoms is optionally replaced by a nitrogen, oxygen or sulfur, and the carbocyclic is optionally substituted with one or more C 1-6 alkyl, R C is selected from the group consisting of (i) hydrogen, or (ii) —C 1-6 alkyl, and n is 0, 1 or 2.