Flavin group

Flavins (from Latin flavus, "yellow") refers generally to the class of organic compounds generally derived from isoalloxazine by varying the R group shown:

Flavins have extensive reduction-oxidation chemistry, and are named for the characteristic yellow color they exhibit in certain oxidation states. Their importance derives from biology: flavins are ubiquitous cofactors for biochemical redox reactions, particularly the electron transport chain.

Despite the lexicographic similarity, flavins are chemically and biologically distinct from the flavanoids and flavonols.

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