Patent ID: 7947837

Claim:
A dimeric compound having the formula: wherein: L is a divalent C 1-20 alkyl group; and Q and Q′ have the formula: wherein: Z is NR b , wherein R b is a C 1-20 alkyl group, a C 1-20 haloalkyl group, a C 2-20 alkenyl group, a C 3-10 cycloalkyl group, or a —Y—C 6-14 aryl group optionally substituted with 1-4 groups independently selected from a halogen, a C 1-20 alkyl group, and a C 1-20 alkoxy group, wherein Y is a divalent C 1-20 alkyl group; each of a and b is CR m , wherein R m is —CN, —OR i , a halogen, a C 1-20 haloalkyl group, or a 3-12 membered cycloheteroalkyl group, wherein R i is a C 1-20 alkyl group or a phenyl group optionally substituted with 1-4 C 1-20 alkyl groups; and each of c, d, e, f, g and h is CH.