Patent ID: 8008344

Claim:
A compound represented by the following formula (I): wherein R 1 and R 2 are each independently O-alkyl, S-alkyl, N-alkyl, O-alkenyl, S-alkenyl, N-alkenyl, O-alkynyl, S-alkynyl, N-alkynyl, O—C 3-8 cycloalkyl, S—C 3-8 cycloalkyl, N—C 3-8 cycloalkyl, O-unsaturated 5- to 10-membered monocyclic or bicyclic ring, S-unsaturated 5- to 10-membered monocyclic or bicyclic ring, N-unsaturated 5- to 10-membered monocyclic or bicyclic ring, alkyl, alkylenyl, alkynyl, C 3-8 cycloalkyl, an unsaturated 5- to 10-membered monocyclic or bicyclic ring or a saturated or unsaturated 5- to 10-membered heterocyclic ring comprising at least one ring heteroatom selected from the group consisting of: N, O and S; or R 1 and R 2 can together form dioxolane; R 3 is O-alkyl, S-alkyl, N-alkyl, O-alkenyl, S-alkenyl, N-alkenyl, O-alkynyl, S-alkynyl, N-alkynyl, O—C 3-8 cycloalkyl, S—C 3-8 -cycloalkyl, N—C 3-8 cycloalkyl, O-unsaturated 5- to 10-membered monocyclic or bicyclic ring, S-unsaturated 5- to 10-membered monocyclic or bicyclic ring, N-unsaturated 5- to 10-membered monocyclic or bicyclic ring, alkyl, alkylenyl, alkynyl, C 3-8 cycloalkyl, an unsaturated 5- to 10-membered monocyclic or bicyclic ring or a saturated or unsaturated 5- to 10-membered heterocyclic ring comprising at least one ring heteroatom selected from the group consisting of: N, O and S; R 4 is OH, OC(═O)alkyl, O-alkyl, S-alkyl, N-alkyl, O-alkenyl, S-alkenyl, N-alkenyl, O-alkynyl, S-alkynyl, N-alkynyl, O—C 3-8 cycloalkyl, S—C 3-8 cycloalkyl, N—C 3-8 cycloalkyl, O-unsaturated 5- to 10-membered monocyclic or bicyclic ring, S-unsaturated 5- to 10-membered monocyclic or bicyclic ring, N-unsaturated 5- to 10-membered monocyclic or bicyclic ring, alkyl, alkylenyl, alkynyl, C 3-8 cycloalkyl, an unsaturated 5- to 10-membered monocyclic or bicyclic ring or a saturated or unsaturated 5- to 10-membered heterocyclic ring comprising at least one ring heteroatom selected from the group consisting of: N, O and S; R 5 is C 4-16 alkyl or C 4-16 alkenyl unsubstituted or substituted with one or more OH, halogen, CN, NO, N 3 , NH 2 , CHO, OR 9 , SR 9 , NR 9 , or COOR 9 ; R 6 is C 2-12 alkyl or C 2-12 alkenyl unsubstituted or substituted with one or more OH, halogen, CN, NO, N 3 , NH 2 , CHO, OR 9 , SR 9 , or NR 9 ; R 7 is hydrogen, halogen, OH, NH 2 , COOH, CHO, CN, NO, ═O, or R 7 and R 8 may together form a double bond, a C 3-6 cycloalkyl, or a 5- to 10-membered heterocyclic ring comprising at least a heteroatom selected from the group consisting of N, O and S; R 8 is hydrogen, halogen, OH, NH 2 , COOH, CHO, CN or NO; R 9 is phenyl, C(═O)R 10 or C(═O)OR 10 ; and R 10 is OH, NHOH or NH 2 ; wherein both R 5 and R 6 are not simultaneously unsubstituted alkyl or alkenyl; or pharmaceutically acceptable salts, stereoisomers, enantiomers, prodrugs or solvates thereof.