Abstract
From the underground part of Iris tenuifolia several flavonoids have been isolated. Six new flavanones have been characterized by high resolution mass spectrometry (HR-MS), and 1H and 13C NMR as 5,2′,3′-trihydroxy-6,7-methylenedioxyflavanone, 5,2′-dihydroxy-6,7-methylenedioxyflavanone, 5,2′,3′-trihydroxy-7-methoxyflavanone, 5,3′-dihydroxy-7,2′-dimethoxyflavanone, 3,5,2′,3′-tetrahydroxy-7-methoxyflavanone and 3,5,3′-trihydroxy-7,2′-dimethoxyflavanone. The crystal and molecular structure of the first flavanone has been established by X-ray crystallography.
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