Patent ID: 8609839

Claim:
A camphor-derived compound as represented in the following formula (I): wherein R 1 and R 2 independently are —OR a , —SR b , or and when R 1 is —OR a or SR b , R 2 is when R 1 is R 2 is —OR a or SR b , wherein R a is H or silyl substituted by one to three C 1-10 alkyl, R b is H or C 1-10 alkyl substituted by C 6-14 aryl, R c and R d independently are C 1-10 alkyl, C 5-14 cycloalkyl, C 4-13 heterocycloalkyl, C 6-14 aryl, or C 4-13 heteroaryl, wherein the heterocyclo and the heteroaryl have at least one heteroatom selected from the group consisting of O, S, Se, and N, or R c and R d are conjugated to form —(CH 2 ) m Z(CH 2 ) n —, wherein m and n are 1, 2, or 3, Z is —CH 2 —, —NH—, —O—, or —S—; and R 3 and R 4 independently are C 1-10 alkyl, C 5-14 cycloalkyl, C 4-13 heterocycloalkyl, C 6-14 aryl, or C 4-13 heteroaryl, wherein the heterocyclo and the heteroaryl have at least one heteroatom selected from the group consisting of O, S, Se, and N, or R 3 and R 4 are conjugated to form —(CH 2 ) m Z(CH 2 ) n —, wherein m and n are 1, 2, or 3, Z is —CH 2 —, —NH—, —O—, or —S—.