Patent ID: 8314142

Claim:
An compound compound of formula I: wherein A is a divalent group selected from the group consisting of S, SO, SO 2 , N(CH 3 ), N(CH 2 —C(O)O—CH 2 CH 3 ), N(CH 2 —COOH), (C 1 -C 6 )alkenylene, NHCO, 1,2,3-triazole, and NHSO 2 ; B 1 and B 2 are both CF 3 ; X 1 and X 2 are both O; n 1 and n 2 are independently selected from the group consisting of 1, 2, 3 or 4; or pharmaceutically acceptable salt thereof, wherein the compound has less than 10 μM IC50 against HCT116 tumor line.