FIELD: chemistry.
SUBSTANCE: invention relates to a novel anhydrous tetomilast type A crystalline form, having powder X-ray diffraction spectrum essentially the same as the powder X-ray diffraction spectrum having characteristic peaks at 2θ = 10.5°, 13.1°, 18.4°, 21.9° and 25.8°, pharmaceutical compositions based thereon and synthesis methods thereof.
EFFECT: considerable advantages in terms of industrial production owing to significantly better filterability.
8 cl, 14 dwg, 8 ex
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