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21-(2-Quinoxalyl)-, 1-[3,5-Di(trifluoromethyl)phenyl]-, 1-(2-Carboxyphenyl)-, and 1-Ethoxycarbonyl-4-oxo-4,5,6,7-tetrahydroindazoles, Chemistry of Heterocyclic Compounds Five-membered 2,3-dioxo heterocycles: CI. Reaction of 3-aroylpyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones with arylhydrazines. Crystal and molecular structure of substituted 2-hydrazonopyrrolo[2,1-c][1,4]benzoxazine, Russian Journal of Organic Chemistry