Patent ID: 7847111

Claim:
A compound of formula (I), (II), (III) or (IV): wherein R 1 is a hydrogen atom or a suitable protecting group for a hydroxyl group; R 2 is a hydrogen atom or a suitable protecting group for a hydroxyl group; R 3 is a hydrogen atom or a suitable protecting group for a hydroxyl group; and R 4 is a hydrogen atom, a C 1 -C 20 alkyl linear or branched, C 1 -C 20 acyl group, C 1 -C 20 halogenated acyl group, C 3 -C 12 cycloalkyl, C 2 -C 20 alkenyl, C 2 -C 20 alkynyl, C 6 -C 12 aryl, C 6 -C 20 aralkyl, C 1 -C 20 alkyloxy C 6 -C 20 alkylaryl, said alkyl, cycloalkyl, alkenyl, alkynyl, aryl, aralkyl, alkylaryl, are unsubstituted or substituted with at least one substituent, each of said substituent(s) being chosen from F, Cl, Br, I, OH, SH, NH 2 , NO 2 , CN, CF 3 , —SH, —OCH 2 Ph, —OPh, —SCH 3 , —SPh, —SCH 2 Ph, —COOH, —COOR 6 in which R 6 is a C 1 -C 6 alkyl, C 1 -C 12 alkyl linear or branched, C 6 -C 12 aryl, C 2 -C 20 alkenyl, C 1 -C 20 alkoxy, C 1 -C 20 alkyl, C 2 -C 20 alkynyl, C 6 -C 20 aralkyl, C 6 -C 12 aryl, C 3 -C 8 cycloalkyl, C 1 -C 20 aminoalkyl, C 6 -C 12 aminoaryl, C 1 -C 20 hydroxyalkyl, C 6 -C 12 hydroxyaryl.