Patent ID: 7012090

Claim:
A compound of the formula: wherein R 1 is chosen from halogen, hydroxyl, C 1-6 alkyl, C 1-6 alkoxy, NR 5 R 6 ; R 2 is chosen from hydrogen, halogen or C 1-6 alkyl; R 3 and R 5 are chosen from hydrogen or C 1-6 alkyl; R 4 is C 1-4 alkyl; R 6 is chosen from hydrogen, C 1-6 alkyl or C(═O)C 1-4 alkyl; X and Y are nitrogen or carbon, but X and Y cannot be the same; the dashed bonds ( - - - ) denote a suitably appointed double bond and single bond; when Y is nitrogen the dashed bonds can both be single bonds; with a proviso when X is nitrogen, Y is carbon, the dashed bonds ( - - - ) denote a double bond between Y and its adjacent carbon and denote a single bond between X and its adjacent carbon, and R 3 and R 4 independently are C 1-4 alkyl, wherein R 3 and R 4 independently are methyl, and pharmaceutically acceptable salts and solvates of the compounds.