Patent ID: 8921578

Claim:
A compound having a structure of: wherein X is S, SO, SO 2 , NR 10 , O, or Se; R 1 -R 8 are each individually H, amino, alkynyl, substituted alkynyl, halogen, alkyl, aryl, substituted alkyl, substituted aryl, nitro, alkoxy, substituted alkoxy, cyano, thiol, substituted thiol, thioether, hydroxyl, heteroaryl, substituted heteroaryl, cycloalkyl, or substituted cycloalkyl, or R 1 and R 2 together form an aromatic ring and R 5 and R 6 together form an aromatic ring; and R 10 is selected from H, amino, alkynyl, substituted alkynyl, halogen, alkyl, aryl, substituted alkyl, substituted aryl, nitro, alkoxy, substituted alkoxy, cyano, thiol, substituted thiol, thioether, hydroxyl, heteroaryl, substituted heteroaryl, cycloalkyl, or substituted cycloalkyl.