Patent ID: 6933316

Claim:
A compound of the following formula: wherein L 1 is C(O); L 2 is a bond; R 1 is aryl or heteroaryl, substituted with alkyloxyl; R 2 is H, aryl, heteroaryl, halogen, nitro, nitroso, cyano, azide, isothionitro, OR, OC(O)R, OC(O)OR, OC(O)NRR′, SO 2 R, SO 3 R, SO 2 NRR′, SR, NRR′, NRSO 2 NR′R″, NRSO 2 R′, NRSO 3 R′, NRC(O)R′, NRC(O)NR′R″, NRC(O)OR′, NRC(N)NR′R″, C(O)OR, or C(O)NRR′; each of R a , R b , R c , and R d , independently, is R, halogen, nitro, nitroso, cyano, azide, isothionitro, OR, OC(O)R, OC(O)OR, OC(O)NRR′, SO 2 R, SO 3 R, SO 2 NRR′, SR, NRR′, NRSO 2 NR′R″, NRSO 2 R′, NRSO 3 R′, NRC(O)R′, NRC(O)NR′R″, NRC(O)OR′, NRC(N)NR′R″, C(O)R, C(O)OR, C(O)NRR′, or R b and R c , R a and R b , or R c and R d taken together are O(CH 2 ) n O; and R c is H, alkyl, alkenyl, alkynyl, cyclyl, heterocyclyl, halogen, nitro, nitroso, cyano, azide, isothionitro, OR, OC(O)R, OC(O)OR, OC(O)NRR′, SO 2 R, SO 3 R, SO 2 NRR′, SR, NRR′, NRSO 2 NR′R″, NRSO 2 R′, NRSO 3 R′, NRC(O)R′, NRC(O)NR′R″, NRC(O)OR′, NRC(N)NR′R″, C(O)R, C(O)OR, or C(O)NRR′; in which each of R, R′, and R″, independently, is H, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cyclyl, or heterocyclyl; and n is 1, 2, 3, 4, or 5.