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Ethinyl Estradiol (Ethinylestradiol) is an orally bio-active estrogen used in almost all modern formulations of combined oral contraceptive pills. EE is hormonally effective by activating the estrogen receptor and thus is an estrogen. It finds its most common use in the estrogen-progestin combination preparations of oral contraceptives.
| Molecular Weight | 296.4 |
| Formula | C20H24O2 |
| CAS Number | 57-63-6 |
| Solubility (25°C) | DMSO 50 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
[2] Amy L Lee. Segesterone Acetate and Ethinyl Estradiol Vaginal Ring (Annovera) for Contraception
[4] Andrea J Rapkin, et al. Drospirenone/ethinyl estradiol
[5] J W Goldzieher, et al. Pharmacokinetics of ethinyl estradiol and mestranol
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