Mestranol

**Semantic type:** Organic Chemical|Pharmacologic Substance

**Definition:** A semisynthetic estrogen. Metabolized by the liver to ethynyl estradiol, mestranol serves as the estrogen component in several combination oral contraceptives. (NCI04)

**Synonyms:** - (17alpha)-3-Methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17-ol - (17alpha)-3-Methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17-ol - MESTRANOL