Patent ID: 8354415

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt, thereof: wherein R 1 and R 2 are independently selected from hydrogen, or optionally substituted C 1 -C 6 alkyl, C 1 -C 6 alkoxy-(C 1 -C 6 )-alkyl, C 3 -C 8 cycloalkyl, aryl, heteroaryl, aryl-(C 1 -C 6 )-alkyl, or heteroaryl-(C 1 -C 6 )-alkyl; or R 1 and R 2 taken together with the nitrogen atom to which they are attached form an optionally substituted 5- or 6-membered ring; R 3 and R 4 are independently selected from hydrogen, or optionally substituted C 1 -C 6 alkyl, C 1 -C 6 alkoxy-(C 1 -C 6 )-alkyl, C 3 -C 8 cycloalkyl, aryl, heteroaryl, aryl-(C 1 -C 6 )-alkyl, or heteroaryl-(C 1 -C 6 )-alkyl; or R 3 and R 4 taken together with the nitrogen atom to which they are attached form an optionally substituted 5- or 6-membered ring; R 5 and R 6 are independently selected from hydrogen, C 1 -C 6 alkyl, aryl, aryl-(C 1 -C 6 )-alkyl, —NHR 7 , —N(—R 8 )—R 9 , —NH—(C═O)—R 10 , —(C═O)—NH—R 11 , —(C═O)—O—R 12 , or halo; and R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 are independently selected from C 1 -C 6 alkyl, aryl, aryl-(C 1 -C 6 )-alkyl and heteroaryl.