prov:value
| - In this reaction, when compound (V) is used in the form of a free acid or a salt thereof, the reaction is desirably carried out in the presence of a condensing agent and, as the condensing agent, for example, carbodiimides such as N,N???-dicyclohexylcarbodiimide, N-cyclohexyl-N???-morpholinoethylcarbodiimide, N-cyclohexyl-N???-(4-diethylaminocyclohexyl)carbodiimide, N,N???-diethylcarbodiimide, N,N
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