Ethinyl Estradiol

**Definition:** A semisynthetic alkylated ESTRADIOL with a 17-alpha-ethinyl substitution. It has high estrogenic potency when administered orally, and is often used as the estrogenic component in ORAL CONTRACEPTIVES.

**Tree numbers:** - D04.210.500.668.651.568.291 - D06.472.334.851.437.968.500

**Synonyms:** - 19-Norpregna-1,3,5(10)-trien-20-yne-3,17-diol, (17alpha)- - Ethynyl Estradiol - Ethinyloestradiol