16-Methylene-17-alpha-acetoxy-19-nor-4-pregnene-3,20-dione 17-Hydroxy-16-methylene-19-norpregn-4-ene-3,20-dione acetate 19-Norpregn-4-ene-3,20-dione, 17-(acetyloxy)-16-methylene- (9CI) 19-Norpregn-4-ene-3,20-dione, 17-hydroxy-16-methylene-, acetate 7759-35-5 Elcometrine Nestorone ST 1435 ST-1435