Norethindrone acetate-d 8 is the deuterium labeled Norethindrone acetate. Norethindrone acetate is a female hormone used for the research of endometriosis. Norethindrone acetate-d8 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.