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The dried roots of S. chinensis (500 g), which were collectedon Geochang, Korea, were ground and extracted with 95% MeOH (1.5 L ¡¤ 2) at room temperature for 24 h. After filtration andconcen tration, the MeOH extract (75 g) was suspended in H2O and then partitioned with the order of n-hexane, CHCl3, andEtOAc to give three fractions, n-hexane- (9.0 g), CHCl3- (17.0 g), andEtOA c-soluble residue (22.0 g), respectively. The EtOAc-soluble fraction exhibiteda ctivities against hACAT- 1 andhACAT- 2, with 81% and58% inhibition at 100 lg/mL, was subjectedto flash silica gel column chromatography with a gradient of chloroform¨Cmethanol (100:0 to 0:100, v/v) to give five fractions. By bioassay-guided fractionation, the one of active fractions was purifiedby column chromatography on silica gel with a gradient of n-hexane¨Cethyl acetate (3:1 to 2:1, v/v) to obtain the sesquineolignan, aucerneol B (1) (20 mg). Subsequently, the other active fraction was subjectedto column chromatography on silica gel with a gradient of n-hexane¨Cethyl acetate (1:1 to 1:2, v/v) to give dineolignans, manassantin A (2) (200 mg), and manassantin B (3) (1 g). |
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lixiaod001
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zhang-81(½ð±Ò+5,VIP+0):thx 9-30 14:20
zhang-81(½ð±Ò+5,VIP+0):thx 9-30 14:20
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3Â¥2009-09-30 11:12:39
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zhang-81(½ð±Ò+10,VIP+0):thx 9-30 14:20
zap65535(½ð±Ò+5,VIP+0):²¹·¢ 12-22 11:52
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2Â¥2009-09-30 06:02:21














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