The present invention provides a cyclic tetrapeptide derivative represented by the following general formula (I) or a pharmaceutically acceptable salt thereof:
wherein
each of R21 and R22 independently denotes hydrogen, a linear C1-C6-alkyl group to which a non-aromatic cycloalkyl group or an optionally substituted aromatic ring may be attached, or a branched C3-C6-alkyl group to which a non-aromatic cycloalkyl group or an optionally substituted aromatic ring may be attached; and
each of R1 and R3 independently denotes a linear C1-C5-alkylene group which may have a C1-C6 side chain, in which the side chain may form a condensed ring structure on the alkylene chain.
The present invention also provides a histone deacetylase inhibitor, an MHC class-I molecule expression-promoting agent and a pharmaceutical composition, each of which comprises the above cyclic tetrapeptide derivative or pharmaceutically acceptable salt thereof as an active ingredient.
本发明提供了下列一般式(I)所表示的环四肽衍
生物或其药学上可接受的盐:其中,R21和
R22各自独立地表示氢、线性的C1-C6烷基,该烷基可以连接一个非芳香环烷基或一个可选择取代的芳香环;或者一个支链的C3-C6烷基,该烷基可以连接一个非芳香环烷基或一个可选择取代的芳香环;R1和R3各自独立地表示线性的C1-C5烷基,该烷基可以具有C1-C6侧链,在该侧链上可以形成缩合环结构的烷基链上。本发明还提供了一种组蛋白
去乙酰化酶抑制剂、一种
MHC-I分子表达
促进剂和一种药物组合物,每种药物组合物都包括上述环四肽衍
生物或药学上可接受的盐作为活性成分。