An easy determination of epimeric androsterones by collision spectroscopy: the molar ratio of 5β-androstan-3α-ol-17-one and 5β-androstan-3β-ol-17-one obtained by hydrogenation of 5β-androstan-3,17-dione on Cu/Al2O3 58-Androstan-3,17-dione on Cu/A1203

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