This research on the chemical constituents of Melodorum fruticosum Lour. root and seeds (Annonaceae) led to the isolation of three heptene derivatives and two triterpenoid compounds. The structure identification and structure elucidation of these compounds were based on the data from various spectroscopic techniques and comparison with reported data. Novel triterpene was assigned the chemical structure lanosta-7, 9(11), 24-trien-3beta-acetoxy-15alpha-ol and was given the trivial name acetylpolycarpol, isolated from its root. The other four are the known compounds (4E)-7-benzoyloxy-6-acetoxy-2, 4-heptadien-4-olide, (4z)-7-benzoyloxy-6-acetoxy-2, 4-heptadien-4-olide (acetylmelodorinol), (4Z)-7-benzoyloxy-6-hydroxy-2, 4-heptadien-4-olide (melodorinol), and lanosta-7, 9(11), 24-trien-3beta, 15alpha-diol (polycarpol)
