Revised Structures, 1-Methylene-1H-[1,4]thiazino[4,3-a]benzimidazole and 10-Methylene-10H-imidazo[2,1-c][1,4]benzothiazine Derivatives, for the Cycloadducts Accompanying Rearrangement from Imidazo[2,1-b]benzothiazole and Thiazolo[3,2-a]benzimidazole Derivatives with Propiolic Esters

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