FIELD: chemistry.
SUBSTANCE: disclosed is a method of purifying a compound of formula 1
which includes the following steps: (1) adding a raw compound 1 to a macroporous adsorption resin, (2) washing the macroporous adsorption resin with an aqueous solution, an organic solvent or a mixed solution of an organic solvent and water, (3) elution using the aqueous solution, organic solvent or mixed solution of an organic solvent and water.
EFFECT: improved method.
9 cl, 7 dwg, 12 ex
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