Patent ID: 7824839

Claim:
A compound of formula I: wherein A 1 is I or S; n 1 is 2 when A 1 is I, and n 1 is 3 when A 1 is S; each Ro is independently alkyl, cycloalkyl, heterocycle, aryl, or heteroaryl, each optionally substituted with one to about five substituents; A 2 is O or N; n 2 is 1 when A 2 is O and n 2 is 2 when A 2 is N; R f is a diradical carbon chain comprising one to about 20 carbon atoms wherein the chain is optionally interrupted by one to five oxygen atoms, and each carbon atom is substituted with zero to two halo groups, or R f is a direct bond; each R 1 is independently H, alkyl, cycloalkyl, heterocycle, aryl, or heteroaryl; n 3 is 0 to about 10; n 4 is 1 or 2; n 5 is 0 to 7; and any aryl or heteroaryl of formula I is optionally substituted with one to five halo, (C 1 -C 6 )alkyl, alkoxy, acyl, alkoxycarbonyl, alkoxyacyl, acyloxy, trifluoromethyl, trifluoromethoxy, hydroxy, cyano, carboxy, nitro, or —N(R 2 ) 2 groups; any alkyl, cycloalkyl, heterocycle, aryl, or heteroaryl is optionally substituted with one to five halo, (C 1 -C 6 )alkyl, alkoxy, acyl, alkoxyacyl, acyloxy, trifluoromethyl, trifluoromethoxy, hydroxy, cyano, carboxy, nitro, —N(R 2 ) 2 , or oxo groups; and each R 2 is independently H, alkyl, aryl, acyl, or aroyl.