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The title compound, 2-azidoethylammonium 3-nitro-1,2,4-triazol-5-onate, N3CH2CH2NH2+.C2H2N4O3-, is a new salt of 3-nitro-1,2,4-triazol-5-one. The triazole ring is planar within 0.0067 (5) Å, the nitro group is rotated 14.0 (4)° out of the ring plane. The H atom on the anion is in position 1.