FIELD: medicine, pharmaceutics.SUBSTANCE: invention refers to compounds of formulaand ,where the ring X represents benzole or pyridine； R1 represents substituted alkyl； R2 represents optionally substituted aryl or optionally substituted 4-7-member monocyclic heterocyclic group or optionally substituted condensed group of heterocyclic group with the benzole ring where the substitutes of optionally substituted aryl, optionally substituted 4-7-member monocyclic heterocyclic group and optionally substituted condensed group of heterocyclic group with the benzole ring are selected from a group consisting of； (1) alkyl optionally substituted by a group selected from halogen and alkoxycarbonyl, (2) alkoxy optionally substituted by halogen, (3) halogen, (4) 4-7-member monocyclic heterocyclic group or (5) amino, optionally mono- or disubstituted alkyl, and (6) hydroxyl, R3 represents hydrogen or alkyl: R4 represents hydrogen, halogen or alkyl； R5 represents hydrogen or alkyl； R6 and R7 are identical or different, and each represents hydrogen or halogen； or pharmaceutically acceptable salt. Also, the invention refers to a IKur blocker containing the compounds described above as an active ingredient, and also to a preventive and therapeutic agent for cardiac arrhythmia and atrial fibrillation.EFFECT: there are produced and described new compounds applicable as a IKur blocker effective for preventing or treating cardiac arrhythmia, such as atrial fibrillation.12 cl, 13 exИзобретение относится к соединениям формулыигде кольцо Х представляет собой бензол или пиридин； R1 представляет собой замещенный алкил； R2 представляет собой необязательно замещенный арил или необязательно замещенную 4-7-членную моноциклическую гетероциклическую группу или необязательно замещенную конденсированную группу гетероциклической группы с кольцом бензола, где заместители необязательно замещенного арила, необязательно замещенной 4-7-членной моноциклической гетероциклической группы и необязательно замещ
