An unusual C6-C6″ linked flavonoid from Miconia cabucu (Melastomataceae)

The flavone dimer, 5-hydroxy-4′,7-dimethoxyflavone-(6-C-6″)-5″-hydroxy-3‴,4‴,7″-trimethoxyflavone, was isolated from a methanol extract of leaves from Miconia cabucu. Its structure was established on the basis of 1D and 2D NMR and HRTOFMS spectroscopic analyses.