The n-BuOH extract was applied to silica gel chromatography using mixtures of EtOAC-MeOH (1:0e0:1) to offer five fractions
(FrⅠ-FrⅤ), Fr Ⅱwas subjected to chromatography on MCI with a stepwise gradient of H2O/MeOH (1:0e0:1) to afford 3 fractions
(Fr aeFr c). Fr bwas purified by preparation HPLC (column: Kromasil 250 10 mm, 5 mm; mobile phase: MeOH: H2O ¼ 30:70)
to gain 3 (49.5 mg), 4 (202.9 mg), 5 (16.8 mg), and 6 (34.6 mg); FrⅢ was subjected to Sephadex LH-20 to get 7 (29.8 mg).