Patent ID: 8362234

Claim:
A compound according to Formula II: wherein R 1 is selected from hydrogen and C 1 -C 6 alkyl; R 2 is selected from hydrogen, hydroxy, OC(O)CH 3 , C 1 -C 6 alkoxy, and C 1 -C 6 alkyl, or together R 1 and R 2 form a single bond; R 7 and R 8 are each independently selected from hydroxy, halogen, hydrogen, C 1 -C 6 alkoxy, and OC(O)CH 3 , or together R 7 and R 8 form a carbonyl; X 1 , X 3 , and X 4 are selected from hydrogen, halogen, nitro, and amino; X 2 is selected from nitro, —NH 2 , alkylamino, and dialkylamino; Y is methylene; n is 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10; Z is OR; R is selected from hydrogen, SiR a R b R c , CR a R b R c , heteroalkyl, and C 1 -C 6 alkyl; R a , R b , and R c are the same as or different from each other and each represents methyl, ethyl, i-propyl, t-butyl, phenyl or substituted phenyl.