FIELD: pharmaceutics.SUBSTANCE: invention relates to the HDAC inhibitors of formula (I) or pharmaceutically acceptable salts, esters or stereoisomers, where R1 represents hydrogen or halogen; R2 represents hydrogen, C1-4-alkyl; R3 is phenyl, unsubstituted or substituted with one or two or three times a halogen, C1-4-alkyl, C1-4-alkoxy, C1-4-alkylsulfonyl, cyano, trifluoromethyl, phenyl, phenoxy, pirrolyl, imidazonyl, oxazolyl or di C1-4-alkylamino-C1-4-alkoxy; naphthalenyl; quinolinyl; C3-7-cycloalkyl; phenylalkyl, where phenyl may not be substituted by or once or twice substituted by halogen, C1-4-alkoxy, phenyl; naftalinilalkyl; phenylcycloalkyl; pyrimidinyl; phenylsulfonyl, where phenyl may not be substituted by or once or twice substituted by halogen, phenyl; or phenylcarbonyl, where phenyl may not be substituted by or once or twice substituted by halogen, C1-4-alkoxy; R4 is hydrogen or C1-4-alkyl; Y represents -CH2- or -C=O; or R4 and Y together with carbon atom to which R4 is connected, can form a phenyl ring or a pyridine ring, which may not be substituted with or substituted with halogen; provided that R2 is C1-4alkyl; A represents -C=O, -CH2- or -CH-alkyl, provided that a and Y simultaneously does not represent -C=O.EFFECT: presented are pharmaceutical compositions of these compounds and use thereof as drug for treating cancer.14 cl, 3 tbl, 101 exИзобретение относится к ингибиторам HDAC формулы (I) или их фармацевтически приемлемым солям, эфирам или стереоизомерам, где R1 представляет собой водород или галоген; R2 представляет собой водород, C1-4-алкил; R3 представляет собой фенил, незамещенный или замещенный один, или два, или три раза галогеном, C1-4-алкилом, C1-4-алкокси, C1-4-алкилсульфонилом, циано, трифторметилом, фенилом, фенокси, пирролилом, имидазонилом, оксазолилом или ди C1-4-алкиламино-C1-4-алкокси; нафталинил; хинолинил; C3-7-циклоалкил; фенилалкил, где фенил может быть не замещен или один или два раза замещен галогеном, C1-4-алкокси, фенилом;