AIM:To study the chemical constituents of the aerial parts of Cirsium setosum (Willd.) MB..METHODS:The chemical constituents were isolated and purified by various chromatographic techniques.Their structures were determined on the basis of physical properties and spectroscopic data.RESULTS:A new megastigmane glycoside and six known compounds were obtained and identified as (7E,9R)-9-hydroxy-5,7-megastigmadien-4-one-9-O-α-L-arabinopyranosyl-(1→6)-β-D-glucopyanoside (1),(6R,7E,9R)-9-hydroxy-4,7-megastigmadien-3-one-9-O-α-L-arabinopyranosyl-(1→6)-β-D-glucopyranoside (2),urolignoside (3),4,9,9'-trihydroxy-3,3'-dimethoxy-8-O-4'-neolignan-7-O-β-D-glucopyranoside (4),citroside A (5),salidrosidin (6),and adenosine (7).CONCLUSION:Compound 1 is a new megastigmane glycoside,named as Xiaojiglycoside A.
CompositaeCirsium setosumMegastigmane glycosideXiaojiglycoside A
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