Patent ID: 7491730

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: W is nitrogen or CH; R 1 is selected from hydrogen or fluorine; and R y is a C 1-4 aliphatic group, optionally substituted with N(R 2 ) 2 or a 5-6 membered saturated ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein: each R 2 is independently selected from hydrogen or a C 1-3 aliphatic group optionally substituted with OH, N(R 3 ) 2 , or a 5-6 membered saturated ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and wherein: each R 3 is independently selected from hydrogen or a C 1-3 aliphatic group.