Patent ID: 7880008

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: is a single or double bond; X 1 is —S—; X 2 is ═CR 3 —; X 3 is a lone pair of electrons; provided that X 1 , X 2 , and N(X 3 ), taken together with the intervening carbon atoms form a 5-membered heteroaryl ring; W is halogen or OR′; R 1 and R 2 , taken together with the nitrogen atom, form a piperidinyl ring (cc) or a piperazinyl ring (dd): wherein z is 0-5; y is 0; R 3 is hydrogen; R 4 is Q-R X ; wherein Q is a bond or is a C 1 -C 6 alkylidene chain and R X is selected from —NR′COR′, —NR′CO 2 R′, —COR′, —CO 2 R′, or —SO 2 R′; R 5 is halogen; and each occurrence of R′ is independently hydrogen or an optionally substituted C 1-6 aliphatic group, a 3-8-membered saturated, partially unsaturated, or fully unsaturated monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur.