FIELD: chemistry.
SUBSTANCE: present invention relates to a method for producing a compound by the formula (1): 
. The method includes adding the compound Z to alcohol, adding hydrochloric acid, heating at a temperature from 60 to 70°C, additionally adding activated carbon to discolour, adding an ester to the resulting filtrate, settling or mixing, followed by separating the precipitated solid, resulting in the above compound, wherein compound Z has the following structural formula: 
. Also proposed are variants of the method for producing the compound by the formula (1).
EFFECT: implementation of a new method for producing a compound by the formula (1), exhibiting stable properties and low hygroscopicity.
4 cl, 11 dwg, 6 tbl, 16 ex
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