FIELD: medicine, pharmaceutics.SUBSTANCE: invention relates to selenophene compound of formula (I)or its pharmaceutically acceptable salt. X stands for selenium, Y and Z stand for carbon atoms； or Y stands for selenium, X and Z stand for carbon atoms； or Z stands for selenium, X and Y stand for carbon atoms； A stands for N； B stands for NR, where Ris selected from hydrogen, or alkyl； Ar stands for aryl or heteroaryl ring； aryl represents benzene or naphthalene ring, and heteroaryl represents 6-membered aromatic ring, which contains one, two or three nitrogen atoms； or heteroaryl stands for 5-membered aromatic ring, which contains one or several heteroatoms, selected from sulphur, oxygen and nitrogen, on condition that not more than one oxygen or sulphur atom is present； and such rings include pyridine, pyridazine, pyrazine, pyrimidine, thiophene, furan, pyrrole, pyrazole, imidazole, oxazole, isoxazole, thiazole and isothiazole； optionally substituted with one, two or several groups, independently selected from hydrogen, halogen, thiol, sulphonamide, Calkyl, secondary Calkyl, tertiary Calkyl, Calkinyl, Calkoxycarbonyl and phenyl； R, Rand Rare independently selected from hydrogen, carboxylic acid, amino, nitro, cyano, sulphonic acid, thiol, trihalomethyl, Calkyl, secondary Calkyl, tertiary Calkyl, Calkoxycarbonyl, aminocarbonyl, Calkylaminocarbonyl, di(Calkyl)aminocarbonyl, and phenyl； or Rand Rare bound, and together with atoms, which they are bound to, they form 5-7-membered optionally substituted carbocyclic or perhydroheterocyclic ring, given in invention formula； or Rand Rare bound, and together with atoms, which they are bound to, form optionally substituted aryl or non-substituted heteroaryl ring, fused with selenophene； and aryl represents benzene ring, and heteroaryl represents 6-membered aromatic ring, which contains one nitrogen atom. Methods of obtaining selenophene compound (versions), pharmaceutical composition, methods of treatment or inhibition, or con
