Patent ID: 8476268

Claim:
A compound of formula (IA) or a salt thereof, wherein R 1 represents one of the following substituents: (1) substituted, C 1 -C 7 -alkyl, wherein said substituents are independently selected from one to nine of the following moieties: deuterium and fluoro, or one to two of the following moieties: C 3 -C 5 -cycloalkyl; (2) optionally substituted C 3 -C 5 -cycloalkyl wherein said substituents are independently selected from one to four of the following moieties: deuterium, methyl, fluoro, cyano and aminocarbonyl; (3) optionally substituted phenyl wherein said substituents are independently selected from one to two of the following moieties: deuterium, halo, cyano, C 1 -C 7 -alkyl, C 1 -C 7 -alkylamino, di(C 1 -C 7 -alkyl)amino, C 1 -C 7 -alkylaminocarbonyl, di(C 1 -C 7 -alkyl)aminocarbonyl and C 1 -C 7 -alkoxy; (4) optionally mono- or di-substituted amine; wherein said substituents are independently selected from the following moieties: deuterium; C 1 -C 7 -alkyl which is unsubstituted or substituted by one or more substituents selected from deuterium, fluoro, chloro and hydroxy; phenylsulfonyl which is unsubstituted or substituted by one or more groups selected from C 1 -C 7 -alkyl, C 1 -C 7 -alkoxy and di(C 1 -C 7 -alkyl)amino-C 1 -C 7 -alkoxy); (5) substituted sulfonyl; wherein said substituent is selected from the following moieties: C 1 -C 7 -alkyl which is unsubstituted or substituted by one or more substituents selected from deuterium and fluoro; and pyrrolidino which is unsubstituted or substituted by one or more substituents selected from deuterium, hydroxy and oxo; (6) fluoro and chloro; and R 3 is selected from: hydrogen; fluoro; chloro; and optionally substituted methyl; wherein said substituents are independently selected from one to three of the following moieties: deuterium, fluoro, chloro and dimethylamino.