Patent ID: 7812183

Claim:
A compound of formula (II) wherein R 1 and R 2 are each methyl; R 3 is hydrogen; X is CR 4 ; R 4 is cyano; a is an integer from 0 to 1; L 1 is selected from the group consisting of —O— and —NH—; R 5 is selected from the group consisting of 1-(2-amino-5-chloro-benzimidazolyl), 1-(2-(4-chlorophenyl)-imidazolyl), 1-(3-phenyl-imidazolyl), 1-(5-(4-chlorophenyl)-imidazolyl), 2-(1H-quinazolin-4-one), 3-(6-phenyl-pyridazinyl), 1-(3-(4-chlorophenyl)-pyridazin-6-one) and 3-(6-nitro-benzthiazolyl); or a pharmaceutically acceptable salt thereof.