Identification of Nekoflavin as 7α-Hydroxyriboflavin

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Nekoflavin, which was found in cat's choroids [Matsui, K. (1965) J. Biochem. 57, 201-206], was identified as 7α-hydroxyriboflavin by comparing the physicochemical properties of nekoflavin acetate with those of chemically synthesized 7α-hydroxyriboflavin pentaacetate. 7α-Hydroxyriboflavin was synthesized from 4-chloro-2-methylbenzonitrile through 7-cyano-7-demethylriboflavin and 7α-aminoriboflavin, which are also new flavins.