Isolation and Identification of Betulin, Lupeol, and β-Amyrin from the Bird-lime of Trochodendron aralioides Siebold et Zuccarini

Three triterpenoid alcohols: betulin, lupeol, and β-amyrin have now been isolated from the unsaponifiable fraction of the ethereal extract of the bark of Trochodendron aralioides Siebold et Zuccarini (Trochodendraceae). Of these, betulin has been further characterized as allobetulin. “Trochosterin”, “an alcohol of m.p. 210°”, and “an alcohol (acetate: m.p. 170°)”, described by earlier groups of workers, have now been confirmed to be nothing other than a mixture composed of lupeol and β-amyrin respectively.