Fused 1,3-oxazine derivatives. Synthesis of 2H-1,3-oxazino(5,6-b)quinoxaline-2,4(3H)-diones (1-oxaalloxazines), 2H-1,3-oxazino(6,5-b)quinoline-2,4(3H)-diones (5-deaza-1-oxaalloxazines), and 2H-pyrido(3,2-e)-1,3-oxazine-2,4(3H)-diones.

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