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noretynodrel norethynodrel norethinodrel nyd progestogen progestin estrogen progestin medication birth control pills gynecological disorders synthetic agonist progesterone receptor hormonal prodrug active metabolites menstrual combined pill metabolism pharmacodynamics 3d contraception control hormonal oral contraceptives mother gynecology obstetrics woman reproduction reproductive female sex hormone menopausal hormone therapy conditions fertility pregnancy replacement function action endocrine endocrinology level prohormone analogue