文摘
Eight new aphanamixoid-type aphanamixoids (C鈥揓, 1鈥?b>8) and six new prieurianin-type limonoids, aphanamixoids K鈥揚 (9鈥?b>14), along with 10 known terpenoids were isolated from Aphanamixis polystachya, and their structures were established by spectroscopic data analysis. Among the new limonoids, 13 compounds exhibited antifeedant activity against the generalist Helicoverpa armigera, a plant-feeding insect, at various concentration levels. In particular, compounds 1, 4, and 5 showed potent activities with EC50 values of 0.017, 0.008, and 0.012 渭mol/cm2, respectively. On the basis of a preliminary structure鈥揳ctivity relationship analysis, some potential active sites in the aphanamixoid-type limonoid molecules are proposed.