Patent ID: 8765719

Claim:
A method for treating adult T-cell leukemia comprising administering to a subject in need thereof a therapeutically effective amount of a compound represented by the formula I: wherein R 1 is H, OH, an alkoxy group, a linear or branched, saturated or unsaturated aliphatic acyl group containing 1 to 10 carbon atoms, a benzoyl group, a naphthoyl group, a linear or branched, saturated or unsaturated aliphatic thioacyl group containing 1 to 10 carbon atoms, a thiobenzoyl group, or a thionaphthoyl group, and R 2 is a linear or branched, saturated or unsaturated aliphatic acyl group containing 1 to 10 carbon atoms, a benzoyl group, a naphthoyl group, a linear or branched, saturated or unsaturated aliphatic thioacyl group containing 1 to 10 carbon atoms, a thiobenzoyl group, a thionaphthoyl group, CONR 7 R 8 , or CSNR 7 R 8 , wherein R 7 and R 8 are each independently selected from H, an alkyl group containing 1 to 3 carbon atoms, or a phenyl group, or R 1 and R 2 together form a ring as represented by —OCH 2 CH 2 CO— or —OCH═CHCO—, X 1 and X 2 are each independently selected from —CR 3 R 4 — and —SiR 3 R 4 —, and R 3 and R 4 are each independently selected from an alkyl group containing 1 to 6 carbon atoms; wherein the compound represented by the formula I is a compound represented by the following formula: