title: Colorimetric determination of ethinyl estradiol in oral contraceptive formulations.
mesh_terms: D002845:Chromatography; D003124:Colorimetry; D003276:Contraceptives, Oral / Q000032:analysis*; D004997:Ethinyl Estradiol / Q000032:analysis*; D007202:Indicators and Reagents; D013607:Tablets
chemical_list: D003276:Contraceptives, Oral; D007202:Indicators and Reagents; D013607:Tablets; D004997:Ethinyl Estradiol