FIELD: chemistry.
SUBSTANCE: invention relates to a method for obtaining a crystal of type II 3-(3,5-dichloro-4-hydroxybenzoyl)-1,1-dioxo-2,3-dihydro-1,3-benzothiazole, having characteristic peaks at a diffraction angle (2θ) at least at 15.1, 18.1, 22.8, 23.7, and 24.0 degrees, determined by X-ray powder diffraction, plus or minus 0.2 in each peak in X-ray powder diffraction analysis (2θ), where the method includes the steps of dissolving 3-(3,5-dichloro-4-hydroxybenzoyl)-1,1-dioxo-2,3-dihydro-1,3-benzothiazole by heating in a mixed solution of ethyl acetate and 2-propanol, and cooling the solution to an internal temperature of 25°C to obtain crystals.:
EFFECT: 3-(3,5-dichloro-4-hydroxybenzoyl)-1,1-dioxo-2,3-dihydro-1,3-benzothiazole crystalline form with good flowability.
2 cl, 4 tbl, 9 dwg, 12 ex
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