Patent ID: 7728142

Claim:
A compound of formula I: wherein R 1 is phenyl optionally substituted by one or more substituents selected from the group consisting of Cl, F, C 1-7 -haloalkyl, hydroxy, C 1-7 -alkoxy, C 1-7 -haloalkoxy, di(C 1-7 )alkylamino and C 1-7 -alkylsulfonyl, or is 5 or 6 membered heterocycloalkyl optionally substituted by OH; R 2 is Br, I, C 1-7 -alkyl, C 1-7 alkoxy, C 1-7 -haloalkyl, C 1-7 -haloalkoxy, aryloxy, arylsulfonyl, C 3-6 -cycloalkyl optionally substituted by phenyl, or NR a R b wherein R a and R b are each independently C 1-7 -alkyl, or R a and R b , together with the nitrogen atom to which they are attached, form a 4 to 8 membered heterocycloalkyl group which is optionally substituted by one or more substituent(s) selected from the group consisting of halo, C 1-7 -alkyl, 017 alkoxy, hydroxy, phenyl and di(C 1-7 )alkylamino; and R 3 is H, C 1-7 -alkyl, or C 3-6 -cycloalkyl; or an optical isomer or pharmaceutically acceptable salt thereof.