Triterpenoids from the Roots of Camellia oleifera C. Abel and Their Cytotoxic Activities

Three new triterpenoids, 21 β ,22 α ‐diangeloyloxy‐3 β ,15 α ,16 α ,28‐tetrahydroxyolean‐12‐en‐23‐al ( 1 ), 21 β ‐angeloyloxy‐3 β ,15 α ,16 α ,28‐tetrahydroxy‐22 α ‐(2‐methylbutanoyloxy)olean‐12‐en‐23‐al ( 2 ), and 21 β ‐angeloyloxy‐3 β ,16 α ,28‐trihydroxy‐22 α ‐(2‐methylbutanoyloxy)olean‐12‐en‐23‐al ( 3 ), along with six known triterpenoids, were isolated from the roots of Camellia oleifera C. Abel . The structures of compounds 1 – 3 were elucidated on the basis of spectroscopic analyses. Moreover, all compounds isolated were evaluated for their cytotoxic activities by MTT (=3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl‐2 H ‐tetrazolium bromide) assay.