FIELD: chemistry.
SUBSTANCE: invention relates to a crystalline form of 6-[(4R)-4-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl]isoquinoline-1-carbonitrile, which demonstrates an X-ray powder diffraction pattern having characteristic peaks , expressed in degrees 2-theta (±0.2° 2-theta) at 7.8, 10.9 and 15.2. Invention also relates to its production method.
EFFECT: obtaining a novel crystalline form of 6-[(4R)-4-methyl-1,1-dioxido-1,2,6-thiadiazinan-2-yl]isoquinoline-1-carbonitrile, having thermal stability and non-hygroscopicity.
8 cl, 4 dwg, 3 tbl, 14 ex
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