| abstract |
Compounds of the formulas are provided: wherein variables Y 1 -Y 5 , X 1 -X 5 , A 1 -A 4 , X, y, n 1 , n 2 , and R 1 -R 15 are as defined herein. Pharmaceutical compositions of the compounds are also provided. In some aspects, these compounds are useful for the treatment of a disease or disorder, including, for example, a proliferative disease, such as cancer. |