A cyclic tetrapeptide derivative represented by the general formula (I):
wherein:
R11, R12, R21 and R22 independently denote a monovalent group selected from hydrogen, a linear or branched alkyl group with 6 or less carbon atoms, benzyl group, 4-methoxybenzyl group, 3-indolylmethyl group, (N-methoxy-3-indolyl) methyl group, (N-formyl-3-indolyl)methyl group, etc.; R3 denotes a divalent group selected from a linear chained hydrocarbon group with 3 or 4 carbon atoms, or the linear branched hydrocarbon group having a branched chain added to the chain, or a divalent group substituted with a heteroatom;
R4 denotes a divalent chained hydrocarbon group with 4 to 6 carbon atoms, or a divalent group derived from said hydrocarbon group by addition etc. of a branched chain on said chain; and a pharmaceutically acceptable salt thereof, or an analogous cyclic tetrapeptide derivative compound; as well as a histone deacetylase enzyme inhibitor, an MHC class-I molecule expression promoting agent and a pharmaceutical composition that comprise said cyclic tetrapeptide derivative as an effective ingredient.
一种由通式(I)表示的环四肽衍
生物,其中:R11、R12、R21和
R22分别独立地表示从氢、具有6个或更少碳原子的线性或支链烷基、苯甲基、4-
甲氧基苯甲基、3-
吲哚甲基、(N-甲氧基-3-
吲哚基)甲基、(N-甲酰基-3-
吲哚基)甲基等单价基团中选择的单价基团;R3表示从具有3或4个碳原子的线性链烃基或在链上添加支链的线性支链烃基或被杂原子取代的双价基团中选择的双价基团;R4表示具有4至6个碳原子的双价链烃基或由在该链上添加支链等而得到的双价基团;以及其药学上可接受的盐或类似的环四肽衍
生物化合物;以及将该环四肽衍
生物作为有效成分的组织脱乙酰化酶
抑制剂、
MHC-I类分子表达
促进剂和制药组合物。