Mestranol

**Definition:** The 3-methyl ether of ETHINYL ESTRADIOL. It must be demethylated to be biologically active. It is used as the estrogen component of many combination ORAL CONTRACEPTIVES.

**Tree numbers:** - D04.210.500.668.651.568.291.500 - D06.472.334.851.437.968.500.500

**Synonyms:** - 19-Norpregna-1,3,5(10)-trien-20-yn-17-ol, 3-methoxy-, (17alpha)- - Ethinyl Estradiol 3-Methyl Ether