19-Nor-17a-pregna-3,5-dien-20-yn-17-ol,3-(cyclopentyloxy)- (8CI); 3-(Cyclopentyloxy)-19-nor-17a-pregn-4-en-20-yn-17-ol;3-(Cyclopentyloxy)-19-nor-17a-pregna-3,5-dien-20-yn-17-ol; Quingestanol
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