Patent ID: 8658802

Claim:
A compound having the following formula: wherein one of A 2 , A 3 , A 4 , A 5 , and A 6 is a vinyl group of the formula: wherein R 1 and R 2 are each independently either a deuterium atom or a perdeuterated alkyl group containing one to six carbon atoms; the remainder of A 2 , A 3 , A 4 , A 5 , and A 6 are independently selected from hydrogen and deuterium atoms; and the nitrogen atom of the pyridine ring is bound to a hydrogen atom, deuterium atom, or an alkyl group optionally substituted with one or more deuterium atoms; provided that, when A 2 , A 4 , or A 6 is the vinyl group of Formula (1-a), and R 1 and R 2 are both deuterium atoms, then the remainder of A 2 , A 3 , A 4 , A 5 , and A 6 are not all hydrogen atoms; and when A 2 or A 6 is the vinyl group of Formula (1-a) and R 1 and R 2 are both deuterium atoms, then the remainder of A 2 , A 3 , A 4 , A 5 , and A 6 are not all deuterium atoms.