The BuOH-soluble extract (93.0 g) was chromatographed over Diaion HP-20 (ϕ 7.0 × 67 cm) as stationary phase eluting with a MeOH-H2O gradient [0:1 (2.0 L), 1:4 (2.0 L), 2:3 (3.0 L), 3:2 (4.0 L),4:1 (2.0 L), 1:0 (2.0 L)] to afford 9 pooled fractions (B1–B9).