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3Synthesis of a New Polyheterocyclic System u2014 Pyrazolo[5u2032,1u2032:2,3]pyrimido[1,6-a]benzimidazole, Chemistry of Heterocyclic Compounds Isomerization in the Oxidative Cyclocondensation of 2-Aroylmethyl-1H-benzimidazoles with o-Aminothiophenol, Chemistry of Heterocyclic Compounds