Patent ID: 8809579

Claim:
A compound represented by formula I: or a pharmaceutically acceptable salt thereof wherein: each R 1 represents H or is selected from the group consisting of halo, CN, OH, NO 2 , CO 2 R a , NR a R b , S(O) p R a , C 1-10 alkyl, C 2-10 alkenyl or C 1-10 alkoxy, the alkyl and alkenyl portions of, C 1-10 alkyl, C 2-10 alkenyl and C 1-10 alkoxy being optionally substituted with 1-5 halo atoms up to perhalo; and further optionally substituted with 1 group selected from OH, oxo and C 1-6 alkoxy; p represents 0, 1 or 2; each R a and R b independently represents H or C 1-4 -alkyl optionally substituted with 1-5 halo atoms up to perhalo; and further optionally substituted with 1 group selected from OH, oxo and C 1-6 alkoxy; R 2 represents C 1-6 alkyl or C 2-6 alkenyl, each optionally substituted with 1-5 halo atoms up to perhalo, and further optionally substituted with 1 group selected from OH, oxo and C 1-6 alkoxy; a and b represents integers selected from 0 and 1, such that the sum of a and b is 0, 1 or 2; R 3 represents Aryl(R d ) 3 or Heteroaryl(R d ) 3 wherein the Heteroaryl group is a 5-10 membered group containing one or two rings, said Heteroaryl group containing one to three heteroatoms, 0-3 of which are nitrogen, and 0-1 of which is oxygen or sulfur; each R d represents H or is selected from the group consisting of: halo, CN, OH, NO 2 , CO 2 R a , C(O)NH 2 , NR a R b , S(O) p R a , C 1-10 alkyl, C 2-10 alkenyl, C 1-10 alkoxy, haloC 1-10 alkoxy, phenyl(R e ) 3 and HAR(R e ) 3 ; each R e represents H or is selected from the group consisting of: halo, CN, haloC 1-6 alkyl, C 1-6 alkoxy and haloC 1-6 alkoxy.