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The asymmetric unit of the title compound, C 8 H 8 N 4 O 2 , contains one half-mol­ecule; a twofold rotation axis bisects the molecule. An intra­molecular N—H⋯O hydrogen bond results in the formation of a five-membered ring, which displays an envelope conformation. In the crystal structure, inter­molecular O—H⋯N hydrogen bonds link the mol­ecules.

(2Z,3Z)-Quinoxaline-2,3(1H,4H)-dione dioxime