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Chemistry of iminofurans: V. Synthesis, structure, and cyclization of 4-R-4-oxo-2-[2-(2-oxo-1,2-diphenylethylidene)hydrazino]but-2-enoic acidsO. A. Komarova; N. M. Igidov; A. E. Rubtsov; V. V. Zalesov; A. S. Makarov; Yu. S. Toksarova · 2010