Fraction 8 (1.8 g) was subjected to Sephadex LH-20 (MeOH-H2O, 7:3) column chromatography to afford four subfractions (8a-8d). Fractions 8c (120 mg) and 8d (60 mg) were further purified by RP-18 column chromatography (eluting
with MeOH-H2O, 2.5:7.5 and 2:8, respectively) to afford 3 (13 mg) and 4 (2 mg), respectively.