A new megastigmane glycoside from the aerial parts of Cirsium setosum

AimTo study the chemical constituents of the aerial parts of Cirsium setosum (Willd.) MB..MethodsThe chemical constituents were isolated and purified by various chromatographic techniques. Their structures were determined on the basis of physical properties and spectroscopic data.ResultsA 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$\prime $-neolignan-7-O-β-D-glucopyranoside (4), citroside A (5), salidrosidin (6), and adenosine (7).ConclusionCompound 1 is a new megastigmane glycoside, named as Xiaojiglycoside A.