FIELD: chemistry.
SUBSTANCE: invention relates to a method of crystallising compounds of formula I or their acid addition salts, 
, in which R1, R2, R3 assume values given in paragraph 1 of the formula of invention. In the process, corresponding formula I compounds or their mixture with impurities are dissolved at high temperature in water, which is saturated with at least one solvent which is immiscible with water, selected from alkylalkanoates, and optionally contains one or more solvents which are miscible with water, and subjected to crystallisation at lower temperature.
EFFECT: increased purity of product.
5 ex, 7 cl
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