FIELD: organic chemistry, chemical technology, medicine, pharmacy. SUBSTANCE: invention relates to crystalline derivative of dibenzothiazepine of the formula (I) 
with melting point from 83 to 86 C. Invention describes also methods for preparing and purification of this compound and pharmaceutical composition eliciting anti-dopaminergic effect used for treatment of psychosis and based on this compound. Invention provides preparing a novel form of compound. EFFECT: improved preparing method, valuable medicinal property of compound. 22 cl, 3 ex
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