18,19-Dinor-17a-pregn-4-en-20-yn-3-one,21-chloro-13-ethyl-17-hydroxy-, (?à)- (8CI); (?à)-17a-Chloroethynyl-13b-ethyl-17-hydroxygon-4-en-3-one;(?à)-17a-Chloroethynyl-13b-ethyl-17b-hydroxygon-4-en-3-one; (?à)-17a-Chloroethynyl-13b-ethyl-4-gonen-17b-ol-3-one; Wy 4355; dl-17a-Chlorethynyl-13b-ethyl-17b-hydroxygon-4-en-3-one
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