prov:value
| - To 1.0 equivalent of a bisformylbenzofuran compound represented by formula (XII) and from 2.0 to 2.4 equivalents of a hydrazine reagent represented by formula (XIII) in an organic solvent, such as ethanol, methanol, tetrahydrofuran, 1,4-dioxane and acetonitrile, from 0.001 to 0.01 equivalent of a catalyst, such as acetic acid, potassium acetate, calcium acetate and sodium acetate, is added, and st
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