| 1. | Others contained up to 2 grams of estriol per 100 grams.
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| 2. | It is said to be 10 times as active as estriol.
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| 3. | Approximately 90 % of precursors in estriol formation originate from the fetus.
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| 4. | Ethinyl estriol and nilestriol are synthetic 17?-ethynylated derivatives of estriol.
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| 5. | Ethinyl estriol and nilestriol are synthetic 17?-ethynylated derivatives of estriol.
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| 6. | It is an estrogen ester, specifically, an ester of estriol.
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| 7. | The plant-derived estrogens are known as estradiol, estrone and estriol.
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| 8. | It has much higher water solubility than does estriol.
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| 9. | Quinestradol is the 3-cyclopentyl ether of estriol and has also been marketed.
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| 10. | These esters and ethers are prodrugs of estriol.
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