Abstract: Eight known compounds were isolated by various chromatographic techniques from the heartwood of Streblus asper and their structures were elucidated on the basis of spectroscopic analysis, they are ginkgetin (1), 4´-methoxy-7-α-L-rhamnosyl-(1→6)-β-D-glucopyranosy isoflavone (2), rhamnocitrin-3-O-β-D-galactopyranoside (3), β-amyrone (4), β-sitosterol (5), vanillic acid (6), behenic acid (7), and docosenoic acid (8). All compounds were isolated from this plant for the first time except for 5. In the antibacterial activities assay, compound 2 showed high antibacterial activities.

Key words: Streblus aspe, ginkgetin, 4´-methoxy-7-α-L-rhamnosyl-(1→6)-β-D-glucopyranosy isoflavone, rhamnocitrin-3-O-β-D-galactopyranoside, antibacterial activity