Synonyms: Etonogestrel/Ethinyl Estradiol Vaginal Ring;131562-74-8;Etonogestrel-ethynylestradiol mixt.;18,19-Dinorpregn-4-en-20-yn-3-one, 13-ethyl-17-hydroxy-11-methylene-, (17alpha)-, mixt. with (17alpha)-19-norpregna-1,3,5(10)-trien-20-yne-3,17-diol;(17S)-13-ethyl-17-ethynyl-17-hydroxy-11-methylidene-2,6,7,8,9,10,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthren-3-one; (8S,9S,13S,14S,17S)-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene-3,17-diol;Nuvaring;