Fraction 10 was chromatographed over a column of silica gel with gradient elution by dichloromethane-methanol (50:1-1:1) to yield compounds B 7 b , B 8 b , and B 9 b . Fraction 7 was decolored through an MCI column and then chromatographed over a column of silica gel with gradient elution by dichloromethane-EtOAc (100:1-30:1) to yield compound B 6 b . Fraction 2 was chromatographed over a column of silica gel with gradient elution via dichloromethane-EtOAc (100:1-15:1) to yield compound B 1 b . Fraction 8 was chromatographed over a column of silica gel with gradient elution by petroleum ether-EtOAc (30:1-1:1) and HPLC (acetonitrile-H SB 2 sb O, 7:3) to obtain two compounds B 4 b and B 5 b . [Extracted from the article]