Patent ID: 7468355

Claim:
A method for treating cancer in a subject, wherein the cancer is selected from the group consisting of colon cancer, renal adenocarcinoma, and melanoma; the method comprising administering to a subject in need of such treatment a therapeutically effective amount of a pharmaceutical composition having chemopreventive activity which contains as an active ingredient a therapeutically effective quantity of a compound of the formula or its enantiomer: wherein R1 and R2 are functional groups selected from the group of hydroxyl, —NH2, —SH; R3 is a functional group selected from the group consisting of hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, aryl, hydroxyl, C1-C6-alkoxy, halogen, NO2, NH3 and COOCH3; X1-X3 are functional groups selected from the group consisting of oxygen, sulfur, —CH2—, or carboxy; R4 is a functional group selected from the group consisting of hydrogen, C1-C6-alkoxy, glucose, B-D-glucopyranose, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, aryl, hydroxyl, halogen NO2, NH3, carbohydrate, amino acid, nucleotide and lipid; and R5 is a functional group selected from the group consisting of hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, aryl, hydroxyl, C1-C6-alkoxy, halogen, NO2, NH3, and CH3.