13-Ethylspiro(18,19-dinor-17?-pregna-5,15-dien-20-yne-3,2'-[1,3]dioxolan)-17-ol and 13-ethylspiro(18,19-dinor-17?-pregna-5(10),15-dien-20-yne-3,2'-[1,3]dioxolan)-17-ol;Gestodene Ketal
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