Patent ID: 8153804

Claim:
A compound of formula I: or a pharmaceutically acceptable salt or solvate thereof, wherein: A is R a is hydrogen, halogen or optionally substituted alkyl; R b is hydrogen, halogen or optionally substituted alkyl; each of R 1 , R 2 , R 3 , R 4 , R 5 is independently hydrogen, halogen, or optionally substituted heterocycle; or R 1 and R 2 , R 2 and R 3 , R 3 and R 4 , or R 4 and R 5 , together with the carbon atoms to which they are attached, form a pyrrolidinone ring; each of R 6 and R 7 is independently hydrogen, halogen or optionally substituted alkyl; and R 8 is an optionally substituted heterocycle or —NR c R d , —C(O)NR c R d , or —C(O)R e , wherein each of R c , R d and R e is independently hydrogen or optionally substituted alkyl; provided that if each of R a , R b and R 1 -R 7 is hydrogen, then R 8 is not NH 2 .