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Chemical synthesis of authentic 24Z- and 24E-ethylidenelanost-8-en-3β-ol. I, lanosterol; II, lanosteryl acetate; III, 3β-acetoxylanost-8-en-24-one (24-ketolanosteryl acetate); IV, lanost-8-en-3β-ol-24-one; V, 24E-ethylidenelanost-8-en-3β-ol; VI, 24Z-ethylidenelanost-8-en-3β-ol (numbering is according to ref. 31).
