Syntheses of 1,3,6,8,10,11,14-heptaazapentaphene-2,4,7,9(14H,3H,8H, -11H)-tetrones (angular mixed flavins), 1,3,5,6,8,10,11,14-octaazapentaphene-2,4,7,9(14H,3H,8H,11H)-tetrones (angular doubled flavins), and their related compounds

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