10-beta-Hydroperoxy-17-alpha-ethynyl-4-estren-17-beta-ol-3-one 10B-HYDROPEROXY-19-NORETHINDRONE 1238-54-6 19-Nor-17-alpha-pregn-4-en-20-yn-3-one, 10-hydroperoxy-17-hydroxy- 19-Norpregn-4-en-20-yn-3-one, 10-hydroperoxy-17-hydroxy-, (17-alpha)- (9CI) BRN 2063727 NSC 92351 Sch 10015