Xanthones from the bark of Garcinia Xanthochymus

Two novel xanthones, 1, 6-dihydroxy-4, 5-dimethoxyxanthone (1) and 1, 5, 6-trihydroxy-7, 8-di(3-methyl-2-butenyl)-6', 6'-dimethylpyrano(2', 3':3, 4)xanthone (2) were isolated from the bark of Garcinia xanthochymus by normal phase and reverse phase silica gel column chromatography. Their structures were elucidated by spectroscopic methods, especially 2D-NMR techniques.