Patent ID: 8420235

Claim:
A compound represented by a formula: wherein R 2 is C 1-30 alkyl, or C 1-30 O 1-15 ether; R 3 and R 4 are independently selected from —H, —F, —Cl, —Br, —I, C 1-10 alkyl, C 1-10 O ether, and optionally substituted C 6-10 aryl; R 5 and R 6 are independently selected from —F, —Cl, —Br, —I, C 1-10 alkyl, C 1-10 O ether, and optionally substituted C 6-10 aryl; X is —O— or —NR 7 —, wherein R 7 is —H, C 1-12 alkyl, or C 1-12 O 1-6 ether; R 8 and R 9 are independently —H, —F, —Cl, —Br, —I, C 1-10 alkyl or C 1-10 ether; and R 10 , R 11 and R 12 are independently halogen, —CN, or —NO 2 .