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Reaction catalyzed by dopachrome converting enzymes. A base on the enzyme abstracts the β-proton on dopachrome causing isomerization of dopachrome to quinone methide. Quinone methide can readily exhibit another isomerization generating DHICA in the case of mammalian DCT. Since quinone methide is a β,γ-unsaturated acid, it can also readily exhibit decarboxylation. With insect DCDT, the reaction accompanies decarboxylation-coupled aromatization resulting in the formation of DHI.
