Patent ID: 7355081

Claim:
A compound according to formula II: wherein: R 11 and R 12 are each independently selected from the group consisting of alkoxy, nitro, amino, and dialkylamino; R 13 and R 14 are each independently selected from the group consisting of hydroxy, alkoxy, â€”OR 18 C(O)R 19 wherein R 18 is lower alkylene or alkenylene and R 19 is alkoxy, and tetrahydropyranyl[THP]; or R 11 and R 13 together are alkylenedioxy; or R 12 and R 14 together are alkylenedioxy; R 15 and R 16 are each independently selected from the group consisting of H, halogen, and nitro; R 17 is â€”R 20 C(O)OR 21 , wherein R 20 is alkylene or alkenylene and R 21 is H or alkyl; X 3 is N, or X 3 is C bonded to a H, alkoxy or nitro; and X 4 is N, or X 4 is C bonded to a H, alkoxy or nitro; or a pharmaceutically acceptable salt thereof, subject to the proviso that R 20 is not alkylene when R 11 , R 12 , R 13 and R 14 are methoxy, and X 3 and X 4 are C bonded to a methoxy.