| http://www.w3.org/ns/prov#value | - The resulting 2-acetylbenzofuran-monohydrazone compound represented by formula (XIX) (1.0 equivalent) and a hydrazine reagent represented by formula (XX) (1.00 to 1.20 equivalents) are heated and stirred in an organic solvent, such as ethanol, methanol, tetrahydrofuran, 1,4-dioxane and acetonitrile, to which a catalyst (0.001 to 0.01 equivalent), such as acetic acid, potassium acetate, calcium ace
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