Patent ID: 8716292

Claim:
A compound having a structure of: wherein R 1 , R 2 , R 3 , R 4 , X, Y, and Z are one of the following combinations of substituents: R 4 R 1 R 2 R 3 H 4-OCF 3 H H 4-OCF 3 3′-NO 2 H 4-Cl 3′-NO 2 H 4-OCF 3 H H 4-OCF 3 H H 4-Cl H H 4-Cl H H 4-Cl H H 3-Cl H H 4-OCF 3 H N H H H 4-Cl H H 4-F 3′-NO 2 H 4-F H H 4-F H H 4-F H H 4-F 3′-CN H 4-Cl 3′-CN H 4-Cl H H 4-Cl H H 4-F H H 4-F H H 4-F H H 4-F 3′-CN H 4-F 3′-NO 2 H 4-F H H 4-F H H 4-F 3′-CN H 4-F H H 4-F 3′-NO 2 H 4-Cl H H 4-Cl H H 3,4- difluoro H H 3,4- difluoro H H 3,4- difluoro H H 3,4- difluoro 3′-CN H 3,4- difluoro 5′-NO 2 H 3,4- difluoro H H 3,4- difluoro H.