Figure 1

Chemical structures of compounds isolated from the stem bark of Garcinia nobilis (1-5) , Oricia suaveolens woods (6-11) and roots (12-17) , and the stem back of Balsmocitrus camerunensis (18-22). Caroxanthone (1), 4-prenyl-2-(3,7-dimethyl-2,6-octadienyl)-1,3,5,8-tetrahydroxyxanthone (2), smeathxanthone A (3), 8-hydroxycudraxanthone G (4), morusignin I (5), stigma-5-en-3-ol (6), lupol (7), evoxanthine 8), norevoxanthine (9), 1-hydoxy-2,3-dimethoxy-10-methylacridone(10), 1,3-dimethoxy-10-methylacridone (11), skimmianine (12), kokusaginine (13), montrifoline (14), 1-hydroxy-4-methoxy-10-methylacridone (15), syringaresinol (16), limonin (17), 1-hydroxy-3,6-dimethoxy-8-methylxanthone (18), xanthoxyletin (19), imperatorin (20), 6,8-dimethoxycoumarin (21), umbelliferone (22).