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Ochnaflavone (4′,5,5″,7,7″-pentahydroxy-3′,4‴-oxydiflavone)(3) and its methyl ethers [(12) and (13)] isolated from the leaves of Ochna squarrosa Linn. (Ochnaceae), were identified from their spectral data and by synthesis of penta-O-methylochnaflavone (1). They are diflavonyl ethers linked via the two phenyl rings.
M. Okigawa, N. Kawano, M. Aqil and W. Rahman, J. Chem. Soc., Perkin Trans. 1, 1976, 580 DOI: 10.1039/P19760000580
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