The Disclosed, low density fat protein of human beings: it effectively lowers the value of cholesterol and (LDL Low Density Lipoprotein), high-density fat protein; increase (HDL High Density Lipoprotein) [MEANS FOR SOLVING PROBLEMS] In the general formula ( and 4,17 (20) -E- pregnadiene 3,16-dione, which is displayed in III) (E- guggulsterone), 4,17 (20) -Z- pregnadiene that appears in the general formula (IV) - to provide a process for selectively producing as a starting material steroids that are commonly denoted by general formula (I) in the reaction scheme, 3,16- dione (Z- guggulsterone). The present invention also provides the preparation of compounds of the general formula (II). [Formula 1]
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