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2Transformation of 3,4-bis(formylamino)pyridine into 4-nitro-1,2,3-triazolo[4,5-c]pyridine 2-oxide in the reaction with nitrating mixture, Russian Journal of Organic Chemistry Cyclization of substituted 3,4-diaminopyridines into 1H-[1,2,3]triazolo[4,5-c]pyridine 2-oxide derivatives during the nitration process, Russian Journal of Organic Chemistry