| http://www.w3.org/ns/prov#value | - ple, there is mentioned a method comprising condensing compound (1) of the following formula and compound (2) of the following formula in the presence of a base in a solvent inert to the reaction (e.g., aromatic hydrocarbons such as benzene, toluene, xylene etc., ethers such as tetrahydrofuran, dioxane etc., ketones such as acetone, 2-butanone etc., halogenated hydrocarbons such as chloroform, dic
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