| http://www.w3.org/ns/prov#value | - A compound represented by formula (7) in which R25 is a hydrogen atom can be synthesized, for example, by subjecting a compound represented by formula (7) in which R25 is --COOH to reflux in a high boiling point solvent, such as diphenyl ether, at a temperature around the boiling point of the solvent, thereby effecting conversion of the substituent.
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