Patent ID: 7795304

Claim:
A compound represented by the following structural formula: wherein R 1 is unsubstituted or substituted and selected from phenyl, thiazolyl, C 2 -C 10 alkenyl, cycloalkyl, C 1 -C 10 alkyl-C 2 -C 10 alkenyl, C 1 -C 10 alkylcycloalkyl, C 1 -C 10 alkylheterocyclyl and C 1 -C 10 alkylheteroaryl; R 2 is unsubstituted or substituted and selected from C 2 -C 10 alkenyl, cycloalkyl, heterocyclyl, heteroaryl, C 1 -C 10 alkyl-C 2 -C 10 alkenyl, C 1 -C 10 alkylcycloalkyl, C 1 -C 10 alkylheterocyclyl and C 1 -C 10 alkylheteroaryl; R 3 and R 4 are independently hydrogen or C 1 -C 10 alkyl; and n is 4-7; or a stereoisomer, enantiomer, racemate, or pharmaceutically acceptable salt thereof.