Patent ID: 7125890

Claim:
A compound of the formula (I-6): wherein: X is —CH(R 5 )—, —CH(R 5 )-alkylene-, —CH(R 5 )-alkenylene-, or CH(R 5 )-alkylene-Y-alkylene-; R 1-6 is selected from the group consisting of: -alkyl; -aryl; -heteroaryl; -heterocyclyl; -alkenyl; -R 6 -aryl; -R 6 -heteroaryl; -R 6 -heterocyclyl; R 2 is selected from the group consisting of: -hydrogen; -alkyl; -alkenyl; -aryl; -heteroaryl; -heterocyclyl; -alkylene-Y-alkyl; -alkylene-Y-alkenyl; -alkylene-Y-aryl; and -alkyl or alkenyl substituted by one or more substituents selected from the group consisting of: —OH; -halogen; N(R 5 ) 2 ; —C(O)—C 1-10 alkyl; —C(O)—O—C 1-10 alkyl; —N 3 ; -aryl; -heteroaryl; -heterocyclyl; —C(O)-aryl; and —C(O)-heteroaryl; Y is —O— or —S(O) 0-2 —; R 3 and R 4 are independently selected from the group consisting of hydrogen, C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 1-10 alkoxy, C 1-10 alkylthio, amino, alkylamino, dialkylamino, halogen, and nitro; each R 5 is independently hydrogen, C 1-10 alkyl, or C 2-10 alkenyl; and R 6 is alkylene, alkenylene, or alkynylene, which may be interrupted by one or more —O— atoms; or a pharmaceutically acceptable salt thereof.