A new kaempferol glycoside, kaempferol 3-O-α-rhamnopyranosyl-(1→2)-[α-rhamnopyranosyl-(1→6)-β-glucopyranoside]-7-O-β-glucopyranoside (2) was isolated from the flowers of Clematis cultivar “Jackmanii Superba”, together with a known kaempferol 3-O-α-rhamnopyranosyl-(1→6)-β-glucopyranoside-7-O-β-glucopyranoside (1). The chemical structures of the isolated glycosides were established by UV, LC-MS, characterization of acid hydrolysates, and 1H and 13C NMR spectroscopy.
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