Patent ID: 8765743

Claim:
A compound of formula (I): wherein R 1 is 9- or 10-membered bicyclic heteroaryl wherein the 9- or 10-membered bicyclic heteroaryl contains from one to three heteroatoms independently selected from oxygen and nitrogen and is optionally substituted by C 1-6 alkyl, C 3-6 cycloalkyl, halo or —CN; R 2 is pyridinyl optionally substituted by one or two substituents independently selected from C 1-6 alkyl, C 2-6 alkenyl, —OR 5 , halo, —(CH 2 ) m NR 6 R 7 , —SO 2 R 8 and phenyl wherein the phenyl is optionally substituted by one or two substituents independently selected from C 1-6 alkyl and —OR 9 ; R 3 is hydrogen or fluoro; R 4 is hydrogen, methyl or ethyl; R 5 is hydrogen, C 1-6 alkyl or 6-membered heterocyclyl wherein the 6-membered heterocyclyl contains one heteroatom selected from oxygen and nitrogen and is optionally substituted by C 1-6 alkyl; R 6 and R 7 are each independently hydrogen, C 1-6 alkyl, C 3-6 cycloalkyl or 6-membered heterocyclyl wherein the 6-membered heterocyclyl contains one heteroatom selected from oxygen and nitrogen and is optionally substituted by C 1-6 alkyl, or R 6 and R 7 , together with the nitrogen atom to which they are attached, are linked to form a 5- or 6-membered heterocyclyl or a 1 0-membered bicyclic heterocyclyl wherein the 5- or 6-membered heterocyclyl or the 10-membered bicyclic heterocyclyl optionally contains an oxygen atom, a sulphur atom or a further nitrogen atom and is optionally substituted by one or two substituents independently selected from C 1-6 alkyl; C 3-6 cycloalkyl; halo; oxo; phenyl optionally substituted by halo; pyridinyl; —(CH 2 ) n OR 10 ; —(CH 2 ) p NR 11 R 12 ; —COR 13 ; and —SO 2 R 14 ; R 8 , R 13 and R 14 are each independently C 1-6 alkyl; R 9 is hydrogen or C 1-6 alkyl; R 10 is hydrogen, C 1-6 alkyl or —(CH 2 ) q phenyl; R 11 and R 12 , together with the nitrogen atom to which they are attached, are linked to form a 5- or 6-membered heterocyclyl optionally containing an oxygen atom; and m, n, p and q are each independently 0, 1 or 2; or a salt thereof.