Patent ID: 8530470

Claim:
A compound of the Formula I: in which: R 1 is (1-4C)alkyl optionally substituted by hydroxy; R 2 is H or (1-4C)alkyl; or R 1 and R 2 together form a 3 to 8 membered nitrogen containing heterocyclyl ring system, which optionally contains 1 or 2 further heteroatoms selected from oxygen, nitrogen and sulphur, wherein a ring sulphur atom is optionally oxidised to form the S-oxide(s), said ring being optionally substituted by hydroxy; R 3 and R 5 are independently selected from H, halogeno, (1-3C)alkoxy and cyano; R 4 is H or fluoro; n is 0 or 1, and when n is 1, the R 6 group is methyl; or a pharmaceutically-acceptable salt thereof.