X15695 is selective and orally active estrogen receptor (ERalpha) degrader. X15695 is an aryl hydrocarbon receptor (AHR) ligand. X15695 enables AHR to form a complex with the ERalpha, promoting its proteasomal degradation. X15695 inhibits the breast cancer cells proliferation, promotes cell cycle block and induces apoptosis. X15695 can be used for the study of breast cancer[1][2].