Methods and compounds useful to induce apoptosis in cancer cells

1. A method of treating cancer in a mammal, comprising contacting the cancer cells with a compound having the formula (I), or a pharmaceutically acceptable salt thereof:

wherein:

each of R 6 , R 8 , and R 9 are hydroxyl;

R 7 is

each R 10 is methyl,

in the amount effective to reduce the viability of the cancerous cells, thereby treating said cancer,

wherein said cancer is selected from the group consisting of lung cancer, colorectal cancer, breast cancer, and prostate cancer.