FIELD: organic chemistry, medicine, cardiology, pharmacy. SUBSTANCE: invention describes compounds of the formula (I) 
and also their stereoisomers, acid-additive salts and hydrates where substituted have values given in description. Invention describes also preparing a pharmaceutical composition showing antiarrhythmic activity. Invention proposes also method of treatment of cardiac arrhythmia in mammals involving administration of antiarrhythmic amount of compound of the formula (I). EFFECT: improved method preparing, valuable medicinal properties. 6 cl, 2 dwg, 11 tbl, 39 ex
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