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Chemical Constituents in N-butanol Extracts from Yao Medicine Pileostegia tomentella

??OBJECTIVE To study the chemical constituents of Yao medicine, Zhongliuteng, the stems of Pileostegia tomentella. METHODS The chemical constituents were isolated and purified by silica gel chromatography repeatedly, and their structures were identified by spectral analysis and chemical METHODS. RESULTS Thirteen compounds were isolated from the stems of P. tomentella and the structures were identified as 1-O-(??-D-glucosyl)-2-2-methoxy-4-(??-hydroxypropyl) phenoxy]propan-3-ol(1),(+)-lyoniresinol-3a-O-??-D-glucopyranoside (2),syringin (3),coniferin (4),dihydroconiferin (5),but-3-enyl-??-D-glucoside (6),4-(2,3-dihydroxypropyl)-2,6-dimethoxy phenyl ??-D-glucopyranoside (7),nikoenoside (8),protocatechuic acid ethyl ester (9),8-methoxy coumarin-7-O-??-D-glucopyranoside (10),6-O-R-L-rhamnopyranosyl-??-D-glucopyranoside methyl salicylate (11), nicotinamide (12), and 3,5-di-O-caffeoyl quinicacid methyl ester (13). CONCLUSION All compounds were obtained from the genus for the first time.