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Leaves of Crataegus sinaica Boiss, contain the new C-glycosyl flavone 3$quot;´,4$quot;´-di-O-acetyl-2$quot;-O-α-rhamnosylvitexin, together with the hitherto unknown, dihydroflavonol 3-O-xyloside, (2R:3R)-dihydroquercetin-3-O-β-xylopyranoside. The known compounds (+)-catechin, (-)-epicatechin, vicenin-II, 2$quot;-O-α-rhamnosylvitexin, and 4$quot;´-O-acetyl-2$quot;-O-α-rhamnosylvitexin were also characterized. Structures were established by conventional methods of analysis and confirmed by ¹H-, ^(13)C-NMR, and ESI-MS.
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