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nordehydroepiandrosterone 19-nor-dhea 19-nordehydroepiandrosterone androgen anabolic steroid progestogen 19-nor-5-dehydroepiandrosterone 19-nor-5-dhea estrane derivative androgen/anabolic steroid nandrolone 19-nortestosterone prohormone dehydroepiandrosterone dhea 5-dhea 19-nor-5-androstenediol bolandiol bolandiol metabolite 3d hormone hormonal therapy replacement function action endocrine endocrinology level analogue anabolic androgenic anabolic-androgenic male sex bodybuilding body-building aas bioactive cell biochemistry biology biomolecule