FIELD: chemistry.
SUBSTANCE: invention refers to medicine, pharmacology and chemical-pharmaceutical industry, namely to a method of purifying a compound of formula (I). Method involves recrystallisation of a compound of formula (I) from a mixture of solvents consisting of a monoatomic alcohol, water and an aprotic solvent in volume ratios of 2.0:1.0:1.0-50.0:25.0:1.0, respectively.
EFFECT: disclosed method enables to obtain a compound of formula (I) with high output and purity.
6 cl, 2 tbl, 1 dwg, 2 ex
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