norethisterone molecule 3d rendering, flat molecular structure with chemical formula and atoms color coding

norethisterone hormonal contraceptive norethindrone progestin molecule molecular structure chemical formula model c20h26o2 atom composition chemistry oxygen hormone compound medicine oral painful atomic menopause period skeletal drug disease generic pharmacy therapy treatment drawing medicinal line menopausal premenstrual progestogen carbon pharmaceutical hydrogen pharma pharmacology icon flat birth rendering atoms color coding