Patent ID: 8648332

Claim:
A compound of the structure wherein D is selected from the group consisting of a diarylamino group, a dialkylamino group, and an arylalkylamino group; A is wherein R a1 and R a2 are independently selected from the group consisting of alkyl, fluorinated alkyl, perfluorinated alkyl, substituted alkyl, aryl, fluorinated aryl, perfluorinated aryl, substituted aryl, heteroaryl, and substituted heteroaryl, and X 1 , X 2 , and X 3 are independently selected from the group consisting of fluoro, cyano, trifluoromethyl, and trifluoromethylsulfonyl; R 1 and R 2 are independently selected from the group consisting of (a) hydrogen, and (b) C1-C6 alkyl; or R 1 and R 2 taken together with the carbon atom to which they are attached form a 3- to 7-membered ring; and R 3 is selected from the group consisting of substituted and unsubstituted C1-C12 alkyl.