This research focused on the chemical constituents of Knema furfuracea. From the 70% acetone extract, four⁃
teen flavonoids were separated and purified by the column chromatography. By means of spectroscopic analysis, the com⁃
pounds were identified as pinocembrin (1), eriodictyol (2), naringenin (3), dihydroquercetin (4), dihydrokaempferol (5), 5,7,
3´,4´-tetrahydroxy -3-methoxyflavone (6), quercetin (7), luteolin (8), (-)-epicatechin (9), biochanin A (10), tectorigenin
(11), 2´,5,7-trihydroxy-4´-metoxyisoflavone (12), 5,7-dihydroxychromone (13), and 7-hydroxychromone (14). The 12 com⁃
pounds were isolated from Knema furfuracea leaves for the first time, with compound ( 4 ) and (10) excluded. |