A new flavonol glycoside was isolated together with two known flavonoids from the stems of Catharanthus roseus (Apocynaceae). Its structure was established as syringetin-3-O-robinobioside by means of UV, MS and NMR data, especially two dimensional experiments.
Apocynaceae, Catharanthus roseus, syringetin-3-O-robinobioside, kaempferol-3-O-(2, 6-di-O-α-L-rhamnopyranosyl-β-D-galactopyranoside), quercetin-3-O-(2
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