Patent ID: 8404844

Claim:
A compound of formula I: wherein: R 1 and R 2 , at each occurrence, independently are selected from a C 1-30 alkyl group, a C 2-30 alkenyl group, a C 2-30 alkynyl group, a C 1-30 haloalkyl group, and a 3-22 membered cyclic moiety, each optionally substituted with 1-4 groups independently selected from halogen, —CN, —NO 2 , —C(O)H, —C(O)OH, —CONH 2 , —OH, —NH 2 , —CO(C 1-10 alkyl), —C(O)OC 1-10 alkyl, —CONH(C 1-10 alkyl), —CON(C 1-10 alkyl) 2 , —S—C 1-10 alkyl, —O—(CH 2 CH 2 O) n (C 1-10 alkyl), —NH(C 1-10 alkyl), —N(C 1-10 alkyl) 2 , a C 1-10 alkyl group, a C 2-10 alkenyl group, a C 2-10 alkynyl group, a C 1-10 haloalkyl group, a C 1-10 alkoxy group, a C 6-14 aryl group, a C 3-14 cycloalkyl group, a 3-14 membered cycloheteroalkyl group, and a 5-14 membered heteroaryl group; R 3 , R 4 , R 5 , and R 6 independently are H or CN, wherein at least one of R 3 , R 4 , R 5 , and R 6 is CN; and n is 1, 2, 3, or 4.