Etynodiol (INN) or ethynodiol (BAN) is a steroidal progestin which was never marketed. A diacylated derivative etynodiol diacetate is used as a hormonal contraceptive.While etynodiol is sometimes used as a synonym for etynodiol diacetate what is usually being referred to is actually etynodiol diacetate and not etynodiol.
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