(17 alpha)-3-methoxy-19-norpregna-1,3,5(10)-trien-20-yn-17-ol. The 3-methyl ether of ethinyl oestradiol. It must be demethylated before it becomes biologically active. It is used as the oestrogen component of many combination oral contraceptives.

Pharmacological action: oestrogens, synthetic.

Chemical name: 19-Norpregna-1,3,5(10)-trien-20-yn-17-ol, 3-methoxy-, (17alpha)-

(12 Dec 1998)

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