Methods The optimal elution requirement was found by comparing several different elution agents, and the pure compound was purified by silica gel column and gel chromatography.

• 方法通过最佳展开剂的选择，找到硅胶柱色谱系统的最佳洗脱条件，粗分离后的供试品通过凝胶柱色谱系统分离纯化得到纯供试品。