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Anaerobic irradiation of an aqueous acid solution of lumichrome (7,8‐dimethylalloxazine) initially leads to the formation of 9‐hydroxylumichrome (II), 5,10‐dihydrolumichrome (III) and 9‐hydroxy‐5,10‐dihydrolumichrome (IV) in equilibrium with lumichrome (I). Prolonged irradiation results in complete conversion of lumichrome into 9‐hydroxy‐5,10‐dihydrolumichrome (IV). The composition of the irradiated solutions has been analyzed from spectral data.
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Düren et al. (1975) studied this question.
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