19-Nor-17-alpha-pregn-4-en-20-yn-3-one, 17-hydroxy-, mixed with 19-nor-17-alpha-pregna-1,3,5(10)-trien-2-yne-3,17-diol JKMS 141 JKMS 201 JKMS 281 Norethisteron mixed with ethinyl estradiol RC9029000