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5Synthesis of some pyridazino[4,5-b]quinoxaline derivatives, Chemistry of Heterocyclic Compounds Some properties of 1-oxo-4-hydroxypyridazino[4,5-b]quinoxaline, Chemistry of Heterocyclic Compounds Investigation of the association of 2,3-dicarboxyquinoxaline and its N,N-dioxide in dimethylformamide and carbon tetrachloride, Chemistry of Heterocyclic Compounds Synthesis of esters of o-dicarboxylic acids of the quinoxaline series, Chemistry of Heterocyclic Compounds Synthesis and study of the structure of some pyridazino[4,5-b]quinoxaline derivatives, Chemistry of Heterocyclic Compounds