FIELD: medicine, pharmaceutics.
SUBSTANCE: invention refers to compounds of formula 
formula (1) 
formula (2) or to their hydrate, solvate, salt or tautomer form where R1 independently represents H or halogen; R2 represents H or --R10-NR11R12 where R10 represents C1-C6 alkylene; R11 and R12 independently represent H, C1-C4 alkyl; and R3 independently represents H or halogen. Besides, the invention covers methods of preparing the compounds of the present invention.
EFFECT: new compounds which can find application for preparing the compounds applicable for treatment or prevention of cardiac arrhythmia.
6 cl, 1 tbl, 2 ex
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