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The flavan nucleus (1) is the basic structure of flavonoids, which include anthocyanidins (e.g., malvidin) (2), flavonols (e.g., quercetin) (3), flavones (e.g., luteolin) (4), flavanones (e.g., naringenin) (5), flavan-3-ols (e.g., epigallocatechin gallate) (6) and isoflavones (e.g., genistein) (7) differing in the level of oxidation and saturation of the C ring.
