FIELD: chemistry.
SUBSTANCE: invention relates to a method for purification of a compound of the formula I, including stages of: a) obtaining an unpurified compound of the formula I or its salt and recrystallization of the specified unpurified compound, using an acetone aqueous solution, by dissolution of the unpurified compound of the Formula I in 30% acetone aqueous solution with heating to 40-45°C, filtration of the resulting solution, and cooling of the specified solution to 18-22°C; and b) isolation of the specified compound of the formula I or its salt by removal of the acetone aqueous solution.
EFFECT: new method for purification of a compound of the formula I is developed, which allows for obtaining a compound of the formula I with increased purity.
8 cl, 10 dwg, 11 ex
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