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Example 3 Preparation of Harpagide (LN-3) From <strong>[19210-12-9]<strong>[19210-12-9]Harpagosid</strong>e</strong> (LN-1) 560 mg of <strong>[19210-12-9]harpagoside</strong> (LN-1) was dissolved in 20 ml of methanol, mixed with 1 ml of 1N sodium hydroxide, allowed to stand overnight at room temperature and then passed through Sephadex LH-20 (solvent: 80% methanol) column. 400 mg of harpagide and 125 mg of sodium cinnamate were obtained from the elude.