An anabolic “supplement” compound sold under various names (Havoc, Epistane, Hemaguno). It’s a methylated, orally-bioavailable version of a steroidal, anti-estrogenic drug, Epitiostanol, which was originally developed in Japan. Epitiostanol is also the parent compound of an illegal anabolic steroid: Mepitiostane (2a, 3a-epithio-5-androstan-17b-yl-1-methoxycyclopentyl ether).
May also be written as 2a,3a-epithio-17a-methyletioallocholanol. While it’s currently being sold on the open market, 2a,3a-epithio-17a-methyl-5a-androstan-17b-ol is of dubious legality, and unlikely to withstand FDA scrutiny.