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The synthesis of 3(6)-nitramino-1,2,4,5-tetrazines via nitration of 3,6-disubstituted s-tetrazines with nitric acid is reported. The effect of 3(6)-amino-1,2,4,5-tetrazine structure and nitric acid concentration on the direction of the nitration reaction is shown. The synthesized products have been characterized by IR, UV, NMR spectroscopy, and DSC analysis.