1) Product Name: YK112) Brand Name : YK113) Appearance: white powder 4) CAS No: 1370003-76-15) Introduction: YK11 is short for (17-alpha,20E) 17,20-[(1-methoxyethylidene)bis(oxy)] 3-oxo-19-norpregna-4,20-diene 21-carboxylic acid methyl ester.
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