FIELD: organic chemistry.
SUBSTANCE: invention relates to a method of producing a crystalline form I of a compound represented by formula (I), having characteristic peaks appearing at a lattice period (d) when 7.34; 5.66; 5.53; 5.30; 5.02; 4.66; 4.37; 4.28; 4.06; 3.68; 3.62; 3.47; 3.36; 3.30; 3.16; 3.11; 3.03; 2.99 and 2.50 Å at 2θ in a powder X-ray diffraction spectrum, in which the compound is crystallized by adding isopropanol to the aqueous solution, containing compound and inorganic salt in amount of 0.1 to 10 molar equivalents relative to compound of formula (I). Invention also relates to a lyophilised composition based on a compound of formula (I) and an inorganic salt and a method for production thereof.
EFFECT: simple method of producing crystals of compound (I) on an industrial scale and a stable lyophilised composition of compound (I).
8 cl, 5 dwg, 2 tbl, 15 ex
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