Patent ID: RE40278

Claim:
A compound of the following structural formula: and pharmaceutically acceptable salts thereof wherein, R 1 and R 2 are independently hydrogen, C 1-6 alkyl or R 1 and R 2 are joined to form pyrrolidine, piperidine, morpholine or imidazole; X is OCH 3 , SO 2 R 3 , SO 2 CF 3 or CN; R 3 is C 1-6 alkyl or a C 5-10 aromatic ring (optionally substituted with a halogen, hydroxyl or C 1-6 alkyl (optionally substituted with halogen or hydroxyl); and Y is hydrogen, Cl, Br, F, CN, CONR 1 R 2 , CF 3 , OCH 3 , SO 2 NR 1 R 2 .