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6Nucleophilic substitution reactions in 2-chloropyridines and 2,5-dioxo-1,2,5,7-tetrahydro-1H-furo[3,4-b]pyridines, Chemistry of Heterocyclic Compounds 4,6-Dimethylpyridine-2,3-dicarbonitrile and its reaction with N-acylhydrazines, Chemistry of Heterocyclic Compounds Synthesis of Some Halogen- and Nitro-substituted Nicotinic Acids and Their Fragmentation Under Electron Impact, Chemistry of Heterocyclic Compounds