The present invention provides an oligonucleotide derivative that enables to easily synthesize an oligonucleotide derivative chemically modified at the 3′-end with two moieties each having a benzene or pyridine structure with a few steps, an aromatic compound serving as a precursor for preparing the modification carrier for synthesizing oligonucleotide derivative, and the oligonucleotide derivative and the oligonucleotide construct using the same, that is chemically modified at the 3′-end with two moieties each having a benzene or pyridine structure, and has good permeability through a cell membrane and excellent nuclease resistance. The modification carrier for synthesizing oligonucleotide derivative, comprising a unit and a carrier carrying the unit directly or via a linker, wherein the unit is represented by the formula (a): wherein, R
1
to R
6
each independently represent hydrogen or a substituent other than hydrogen; Z
1
and Z
2
each independently represent CH or nitrogen; and X represents oxygen or sulfur.
本发明提供了一种寡
核苷酸衍
生物,使得可以通过几个步骤轻松地合成在3'-端带有两个
苯或
吡啶结构的
化学修饰寡
核苷酸衍
生物,还提供了作为制备修饰载体的前体的芳香化合物,以及使用相同的
化学修饰在3'-端带有两个
苯或
吡啶结构的寡
核苷酸衍
生物和寡
核苷酸构建物,具有良好的细胞膜渗透性和出色的
核酸酶抵抗性。用于合成寡
核苷酸衍
生物的修饰载体包括一个单元和一个携带该单元的载体,直接或通过连接剂携带该单元,其中该单元由式(a)表示:其中,R1到R6各自独立地表示
氢或不是
氢的取代基;Z1和Z2各自独立地表示CH或
氮;X表示
氧或
硫。