FIELD: organic chemistry, medicine, pharmacy.
SUBSTANCE: invention relates to arylated amides of furan and thiophene carboxylic acids of the formulae (Ia) 
and (Ib) 
wherein W means oxygen or sulfur atom; R(1) means -C(O)OR(9) or -COR(11) wherein R(9) and R(11) mean independently of one another CxH2x-R(14) wherein x means 0, 1, 2 or 3; R(14) means phenyl, and to their pharmaceutically acceptable salts also. Also, invention describes a pharmaceutical composition and using proposed compounds a medicinal agents. Compounds can be used as anti-arrhythmic biologically active substances and especially in treatment and prophylaxis of atrium arrhythmia.
EFFECT: valuable medicinal properties of compounds and composition.
11 cl, 29 ex
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