Patent ID: 7737184

Claim:
A compound represented by the following structural formula: wherein R 1 and R 2 are, independently of each other, unsubstituted or substituted and selected from C 1 -C 10 alkyl, C 2 -C 10 alkenyl, cycloalkyl, aryl, heterocyclyl, heteroaryl, C 1 -C 10 alkyl-C 2 -C 10 alkenyl, C 1 -C 10 alkylcycloalkyl, C 1 -C 10 alkylaryl, C 1 -C 10 alkylheterocyclyl and C 1 -C 10 alkylheteroaryl; and R 3 , R 4 and R 5 are independently hydrogen or C 1 -C 10 alkyl; or R 2 and R 5 together with the nitrogen atom to which they are attached, form a nitrogen-containing heterocyclic ring; X is O or S; and n is 5 or 6; or a stereoisomer, enantiomer, racemate, or pharmaceutically acceptable salt thereof.