Methods Three compounds were isolated by a combination of RP-18and silica gel column chromatographies, and their structures were identified by spectral methods.
方法采用硅胶和反相硅胶RP- 18柱色谱分离，运用有机波谱分析确定化合物结构。
2
METHODS Many chromatographies were used in the isolation procedures, while the structures of isolated compounds were determined by NMR and MS spectral analysis.