Steroids are an important class of natural products with various biological functions: steroidal hormones (estradiol, testosterone), vitamins (vitamin D3), lipids (cholesterol). This app is designed for chemistry, biochemistry, and pharmacy students. It provides you with a convenient tool to get acquainted with chemical formulas of the most important natural and synthetic steroids. Many of them are top-selling drugs used for a treatment of asthma, baldness, prostate cancer, and as oral contraceptives. * 40 steroid structures Choose the game mode: * Spelling quizzes. * Multiple-choice questions (with 4 or 6 answer options). A learning tool: * Flashcards. The app is translated into 9 languages, including English, German, Spanish and many others. So you can learn the names of the steroids in any of them.