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C18H24O2 An estrogenic hormone produced by follicle cells of the vertebrate ovary; provokes estrus and proliferation of the human endometrium, and stimulates ICSH (interstitial-cell-stimulating hormone) secretion.



C18H24O2, a female sex hormone of the estrogen group with the structural formula

Estradiol occurs as colorless crystals with a melting point of 176°–178°C. Poorly soluble in water, it dissolves better in organic solvents. It is optically active, with a specific rotation of [α]D= +81°.

Estradiol was first isolated in 1935 from the follicular fluid of the ovaries of swine by the American biochemist E. Doisy. Of all the estrogens, it has the highest physiological activity, but it is rapidly inactivated in the body. Longer-acting preparations of estradiol (estradiol dipropionate and estradiol benzoate) are obtained by the esterization of estradiol with various organic acids. Estradiol has important physiological functions (seeESTROGEN).

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Revenue was derived primarily from sales of ESTRASORB(R) and Gynodiol and from government-funded research and development programs.
Cost of products sold related to Novavax's legacy products ESTRASORB and Gynodiol declined to $1.
Figure 43: Prostate Cancer, Global, Gynodiol, Chemical Structure 85
Figure 46: Prostate Cancer, Global, Gynodiol, Chemical Structure