Compound 3 was isolated as a brown oil and its molecular formula was determined to be C14H22O4 The position of this methylene group at C-8 was confirmed using HMBC (Figure ) which showed clear correlations from the methylene protons to three carbon atoms: an oxygenated methine carbon at δC 65.7 (C-7), and two olefinic carbons at δC 140.7 (C-8) and 135.8 (C-9).