Shelf life (days): 1460.0
Formulation: A crystalline solid
Formal Name: 3-methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17a-ol
Purity: ≥98%
Formula Markup: C21H26O2
Formula Weight: 310.4
CAS Number: 72-33-3
Notes: Mestranol is a semisynthetic estrogen prodrug of ethynyl estradiol (Item No. 10006486), an estrogen receptor agonist.{41236} It is demethylated in the liver to ethynyl estradiol. Mestranol has estrogenic properties, inducing RNA synthesis in homogenized mouse uteri following a dose of 1.6 µg/animal, which is 16-fold higher than the dose of ethynyl estradiol needed to induce a similar response.{41237} Formulations containing mestranol were previously used as oral contraceptives.