X15695 is a selective and orally active estrogen receptor (ERalpha) degrader, acting as a ligand for the aryl hydrocarbon receptor (AHR). It facilitates the formation of a complex between AHR and ERalpha, promoting proteasomal degradation. X15695 inhibits the proliferation of breast cancer cells, induces cell cycle arrest, and triggers apoptosis, making it useful for breast cancer research.