ato Diaion HP-20 macroporous resin (80 g) column chromatography eluting with a gradient of EtOH−H2O (0 :100, 30 : 70, 60 : 40, 100 : 0) to provide fou fractions (A−D),respectively. 到洗脱以梯度的Diaion HP-20 macroporous树脂(80 g)柱层析EtOH−H2O (0 :100, 30 : 70, 60 ...