Two new flavone, cirsitakaoside (IV), C
23H
24O
11, mp 246-247°, and cirsitakaogenin (VI), C
17H
14O
6, mp 259-260°, have been isolated from the fresh leaves of Cirsium japonicum D.C. var. takaoense KITAMURA (Compositae) together with pectolinarin (I). The structures of cirsitakaoside (IV) and cirsitakaogenin (VI) have been determined as 5, 7-dihydroxy-
8
,
4
'-dimethoxyflavone-7-O-β-D-glucoside and 5, 7-dihydroxy-
8
,
4
'-dimethoxyflavone, by chemical degradation and spectral means, respectively.
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