Patent ID: 7652035

Claim:
A compound represented by the following structure: or a pharmaceutically acceptable salt, ester, or stereoisomer thereof, wherein: R 1 at each occurrence is independently C 1 -C 6 alkyl; n is 0, 1 or 2; R 2 is C 1 -C 10 alkyl, substituted C 1 -C 10 alkyl, aryl, substituted aryl, arylalkyl, substituted arylalkyl, heterocyclyl, substituted heterocyclyl, —OR 3 , or —NR 4a R 4b ; R 3 is C 1 -C 10 alkyl, substituted C 1 -C 10 alkyl, arylalkyl, substituted arylalkyl, C 1 -C 10 alkoxyalkyl, substituted C 1 -C 10 alkoxyalkyl, heterocyclealkyl, or substituted heterocyclealkyl; R 4a and R 4b are the same or different and independently hydrogen, C 1 -C 10 alkyl, substituted C 1 -C 10 alkyl, arylalkyl, substituted arylalkyl, heteroarylalkyl, substituted heteroarylalkyl, C 1 -C 10 alkoxyalkyl or substituted C 1 -C 10 alkoxyalkyl, with the proviso that R 4a and R 4b cannot both be hydrogen; R 5 is hydrogen or C 1 -C 6 alkyl; Ar is substituted phenyl, pyridyl or substituted pyridyl; and Het is heterocyclyl or substituted heterocyclyl.