Patent ID: 7723546

Claim:
A compound of Formula I, II, or IV: wherein Ar is the same or different at each occurrence and is phenyl, naphthyl or heteroaryl having from 2 to 30 carbon atoms, said phenyl, naphthyl, or heteroaryl being optionally substituted with one or more groups selected from alkyl, aryl, nitro, cyano, —N(R 1 )(R 2 ), hydroxy, carboxy, alkenyl, alkynyl, cycloalkyl, alkoxy, aryloxy, heteroaryloxy, alkoxycarbonyl, perfluoroalkyl, perfluoroalkoxy, arylalkyl, thioalkyl, —S(O) 2 —N(R 1 )(R 2 ), —C(═O)—N(R 1 )(R 2 ), (R 1 )(R 2 )N-alkyl, (R 1 )(R 2 )N-alkoxyalkyl, (R 1 )(R 2 )N-alkylaryloxyalkyl, —S(O) s -aryl or —S(O) s -heteroaryl, where s is 0, 1 or 2 and each R 1 and R 2 is independently an optionally substituted alkyl, or aryl group; or R 1 and R 2 , together with the nitrogen atom to which they are bound, optionally form a ring system.