A derivative of ionidamine; inhibits human spermatozoa capacitance potentially by blocking chloride channels; tightens the Sertoli cell permeability barrier dose-dependently in vitro; increases testin expression in adult rat testes within one day and depletes spermatids and spermatocytes when administered at a dose of 25 or 50 mg/kg; reversibly induces infertility of male rats within 3-7 weeks, which lasts 4-14 weeks; decreases proliferation of SGC-7901, MDA-MB-231, Smmc-7721, and MIA Paca-2 cells (IC50s = 58, 13.8, 72.3, and 52.7 μM, respectively)