|Superclasses:||an organic heterocyclic compound → an organic heterobicyclic compound → a pteridine → a benzopteridine → a flavin|
|an organic heterocyclic compound → an organonitrogen heterocyclic compound → a pteridine → a benzopteridine → a flavin|
Flavin can exist in two different redox states, which it converts between by accepting or donating electrons. The fully oxidized form (or quinone form) accepts two electrons and two protons to become the fully reduced form (hydroquinone form). The reduced form can be oxidized to a semireduced form (semiquinone) by donating one electron and one proton. A second oxidation results in restoring the initial quinone form.
The conjugated ring system of fully oxidized flavin confers a bright yellow color, and its name is derived from flavus, Latin for yellow.
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