A new triterpenoid isolated from fruits of Liquidambaris Fructus Studies on Chemical Constituents in Fruit of Eucalyptus globulus Chemical constituents in roots of Ilex Cornuta Chemical constituents in roots of Ilex cornuta Qualitative and quantitative methods of betulonic acid in fruits of Liquidambar formosana Studies of betulonic acid on cell cycle and related protein expressions on mice of bearing H22 tumor cells