YK-11;19-Norpregna-4,20-diene-21-carboxylic acid,17,20-((1-methoxyethylidene)bis(oxy))-3-oxo-,methyl ester,(17alpha,20E)-;YK11 cpd;(17alpha,20E)-17,20-((1-Methoxyethylidene)bis(oxy))-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester;YK11;
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