Triterpenoids from Cedrela sinensis

Twenty-three new triterpenoids (), all having an apotirucallane skeleton, were isolated from the seeds, leaves, and stems of Cedrela sinensis (Meliaceae). Their structures were determined by 2D NMR experiments, X-ray crystallographic analysis, and chemical methods. These triterpenoids showed a moderate cytotoxic activity against P-388 murine leukemia cells (IC50 0.26–9.9 μg/mL).