What is "methallenestril"

n. A particular estrogen.

Methallenestril ( INN) (brand names Cur-men, Ercostrol, Geklimon, Novestrine, Vallestril), also known as methallenoestril ( BAN) and as methallenestrol, is a synthetic, non-steroidal estrogen that was formerly used to treat menstrual issues but is now no longer marketed. It is a seco- analogue of bisdehydrodoisynolic acid, and although methallenestril is potently estrogenic in rats, in humans it is only weakly so in comparison. Vallestril was a brand of methallenestril issued by G. D. Searle & Company in the 1950s.