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Metabolism of 2-3H- and 4-14C-17alpha-ethynylestradiol 3-methyl ether (mestranol) by women.

A mixture of 2-3H and 4-14C-mestranol was administered orally to five women and 2-3H-mestranol alone to one woman. Reactions involving position 2 were extensive as judged by liberation of 3H into body water (14-45% of the dose). 17alpha-Ethynylestradiol, 2-hydroxy-17alpha-ethynylestradiol, 2-methoxy-17alpha-ethynylestradiol, 2-hydroxy-17alpha-ethynylestradiol 3-methyl ether and 16geta-hydroxy-17alpha-ethynylestradiol were measured in the "glucuronide" and pH1 fractions and mestranol, D-homoestrone-17a and D-homoestradiol-17abeta were also measured in the "glucuronide" fraction frum the urine to two of the women by reverse isotope dilution. Radioactive 2-methoxyestradiol accounted for less than 0.011% of the 14C dose in the "glucuronide" fraction of one of the women, consistent with the extent of de-ethynylation previously reported (Steroids, 25, 343 (1975).

Adult

Mestranol.

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Animals