FIELD: chemistry.
SUBSTANCE: invention relates to new benzofuran derivatives of formula II 
or their pharmaceutically acceptable salts, where R1 is H or C1-C10 alkyl; R2 is H or C1-C10 alkyl; n ranges from 0 to 4; p ranges from 0 to 1; R3 and R4 represent H, as well as to pharmaceutical compositions based on said derivatives and methods of treating cardiac arrhythmia using these compositions.
EFFECT: increased effectiveness of composition and method of treatment.
15 cl, 12 dwg, 3 ex
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