FIELD: chemistry.
SUBSTANCE: invention describes novel, highly crystalline mono(benzenesulphonic acid)besylate salts and polymorphs of the compound of formula (I): 
, a pharmaceutical composition containing said compounds, methods of producing the salts and use thereof as medicinal agents, particularly for sedative or hypnotic, anxiolytic, muscle relaxation or anticonvulsant purposes.
EFFECT: improved method.
32 cl, 36 dwg, 22 tbl, 10 cl
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