| ethynyl estradiol | 17a-ethynyl-1,3,5-estratriene-3,17-diol;a semisynthetic derivative of 17b-estradiol; active by mouth, with a long half-life, it is among the most potent of known oestrogenic compounds; used in oral contraceptive preparations. Synonym: ethinyl estradiol. Estradiol undecylate, an esterified natural oestrogen for parenteral use. Estradiol valerate, estra-1,3,5(10)-triene-3,17b-diol 17-valerate;same actions and uses as estradiol, but with a prolonged duration of action; administered in sesame oil by intramuscular injection. (05 Mar 2000) |
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