| prov:value
| - As to the basic condensing agent used in this reaction, a carbonate such as sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate or the like, metal hydroxide such as sodium hydroxide, potassium hydroxide or the like, a metal alcoholate such as sodium methylate, sodium ethylate or the like, a tertiary amine such as pyridine, triethylamine or the like can be exemplified.
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