Limonoids and Triterpenoids from the Stem Bark of Melia toosendan

Four new limonoids (1, 3, 4, 6), named meliatoosenins A-D, eight new euphane- and tirucallane-type triterpenoids (8-15), named meliascnins A-H, and 13 known compounds have been isolated from the stem bark of Melia toosendan. The structures of new compounds were established on the basis of 1D and 2D NMR experiments ((1)H-(1)H COSY, HSQC, HMBC, and ROESY).