1) Synthetic estrogen 
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. == See also == ...