| http://www.w3.org/ns/prov#value | - As an example of the organic solvent for use in extraction, chloroform may be used. [0123] The crude product of the meso-meso dimer of the general formula (IV) thus obtained, if necessary, is washed with an aqueous solvent such as aqueous sodium bicarbonate or water, and purified by chromatography or the like and thereafter, subjected to the next step (c). [0124] In the step (c), the meso-meso dim
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