Patent ID: 6887997

Claim:
A compound having the following formula: wherein R 1 is H or alkyl; R 2 is C 2-6 alkyl, alkenyl, aryl, heteroaryl, cyclyl, or heterocyclyl; R 3 is alkyl, alkenyl, cyclyl, heterocyclyl, or (CR a R b ) m X(CR c R d ) n Y; in which X is a bond, O, S, or NR e ; Y is alkoxy, aryloxy, heteroaryloxy, OC(O)R e , C(O)R e , N(R e R eâ€² ), NR e C(O)R eâ€² , S(O) 2 R e , or SR e ; each of m and n, independently, is 1,2,3,4, or 5; each of R a , R b , R c , R d , R e , and R eâ€² , independently, is H, alkyl, aryl, heteroaryl, cyclyl, or heterocyclyl; R 4 is H, alkyl, alkenyl, cyclyl, heterocyclyl, or (CR a R b ) m X(CR c R d ) n Y; in which X is a bond, O, S, or NR e ; Y is alkoxy, aryloxy, heteroaryloxy, OC(O)R e , C(O)R e , N(R e R eâ€² ), NR e C(O)R eâ€² , S(O) 2 R e , or SR e ; each of m and n, independently, is 1,2,3,4,or 5; each of R a , R b , R c , R d , R e , and R eâ€² , independently, is H, alkyl, aryl, heteroaryl, cyclyl, or heterocyclyl; and R 5 is H or halogen.