[Chemical constituents of flavonoids from flowers of Koelreuteria paniculata].

Objective: To study the chemical constituents from flowers of Koelreuteria paniculata.

Methods: Column chromatography and spectral analysis were used to isolate and identify the constituents.

Results: The EtOAc fraction from flowers of Koelreuteria paniculata was separated and purified. Nine compounds were obtained and identified as:sitosterol glucoside (I), gallic acid (II), kaempferol (III), luteolin (IV), kaempferol-3-O-(6"-acetyl)-beta-D-glucopyranoside (V), hyperoside-2"-O-acetyl (VI), hyperoside-2"-O-galloyl (VII), hyperoside (VIII), kaempferol-3-O-D-glucopyranoside (IX).

Conclusion: Nine compounds are isolated for the first time from flowers of Koelreuteria paniculata. Compounds IV, V, VI and IX are isolated from this genus for the first time.