Patent ID: 8329747

Claim:
A method for treating cancer comprising administering to a subject in need thereof an effective amount of at least one compound chosen from compounds of formulae (I), (II), (III), and (IV): wherein in formula (I): X 1 is O, NH, or S; X 2 is O, NH, or S; X 3 is O, NH, or S; R 1 and R 2 each independently represents —H, —C(O)NH 2 , —S(O)NH 2 , or —S(O) 2 NH 2 , in formula (II): X 1 is O, NH, or S; X 2 is O, NH, or S; X 3 is O, NH, or S; R 1 and R 2 each independently represents —H, —C(O)NH 2 , —S(O)NH 2 , or —S(O) 2 NH 2 , in formula (III): X 1 is O, NH, or S; X 2 is O, NH, or S; X 3 is O, NH, or S; R 1 and R 2 each independently represents, —H, —C(O)NH 2 , —S(O)NH 2 , or —S(O) 2 NH 2 , in formula (IV): X 1 is O, NH, or S; X 2 is O, NH, or S; X 3 is O, NH, or S; R 1 and R 2 each independently represents, —H, —C(O)NH 2 , —S(O)NH 2 , or —S(O) 2 NH 2 , or a pharmaceutically acceptable salt thereof.