18,19-Dinor-17-alpha-pregn-4-en-20-yn-3-one, 21-chloro-13-ethyl-17-hydroxy-, mixed with 3-methoxy-17-alpha-19-norpregna-1,3,5(10)trien-20-yn-17-ol Chloroethynyl norgestrel mixed with mestranol (20:1) JF7980000 Mestranol mixed with chloroethynyl norgestrel (1:20) Wy-4355 mixed with Mestranol (20:1)