Patent ID: 8507494

Claim:
A compound of formula (I): and pharmaceutically acceptable salts thereof, wherein R 1 represents —NR 2 R 3 , or a nitrogen containing C 5-10 heterocyclyl; wherein said heterocyclyl is optionally substituted with one or more of R a ; R 2 and R 3 independently represent (a) hydroxy, (b) —O—C 1-6 alkyl, said alkyl optionally substituted with 1 to 3 groups of R a ; (c) —C 1-6 alkyl, said alkyl optionally substituted with 1 to 3 groups of R a ; (d) -hydrogen; R a 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 , wherein R A and R B are 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 replaced by a nitrogen, oxygen or sulfur, and the carbocyclic is optionally substituted with one or more C 1-6 alkyl, (g) represents —C(═O)—R C , —S(O) n —R C ; C 5-10 heterocyclyl, and C 6-10 aryl, said heterocyclyl and aryl optionally substituted with 1 to 3 groups of R C ; and wherein R C is selected from the group consisting of (i) hydrogen, (ii) —C 1-6 alkyl, (iii) —O—C 1-6 alkyl, (iv) CF 3 , (v) halogen, (vi) cyano, n is 0, 1 or 2.