| http://www.w3.org/ns/prov#value | - e attained by a method in which the compound is treatedwith boron trichloride or boron tribromide in methylene chloride at atemperature of -100?? C. to room temperature under a stream of aninert gas such as argon or nitrogen.Further, when a compound of formula [I] in which R is a phosphoric acidresidue is synthesized, the desired compound of free acid type or salttype can be obtained by a conventi
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