Fluasterone

A steroid is an organic compound with four fused rings (designated A, B, C, and D) arranged in a specific molecular configuration. Steroids have two principal biological functions: as important components of cell membranes that alter membrane fluidity; and as signaling molecules. Examples include the lipid cholesterol, sex hormones estradiol and testosterone,:\u200a10\u201319\u200a anabolic steroids, and the anti-inflammatory corticosteroid drug dexamethasone. Hundreds of steroids are found... [wikipedia]