Xanthones and coumarins from Kielmeyera lathrophyton

Three xanthones and six coumarins were isolated from the hexane extract of the stems of Kielmeyera lathrophyton, among them two new prenylated xanthones 1,5-dihydroxy-6'-methyl-6'-(4-methyl-3-pentenyl)-pyrano(2',3':3,2)-xanthone, 1,7-dihydroxy-6'-methyl-6'-(4-methyl-3-pentenyl)- pyrano(2',3':3,2)-xanthone, and two new 4-s-butylcoumarins 7-hydroxy-8-(3-methyl-1- oxobutyl)-4-s-butyl-6',6'-dimethylpyrano (2',3':5,6)-coumarin, 7-hydroxy-8-(2-methyl-1-oxobutyl)- 4-s-butyl-6',6'-dimethylpyrano (2',3':5,6)-coumarin, along with the compounds, delta -tocotrienol, friedelin, 24 alpha -ethylcholest-5-en-3-one, and, 24 alpha -ethylcholest-5,22-dien-3-ol. These compounds were identified by comparison with literature data, and their spectroscopic properties.