Disclosed is a nucleoside derivative of formulae (I-1) or a salt thereof:
in which R1, R2, R3, R5, A1 to A3, B, X, Y, and k are described herein. Also provided are a 5′-phosphate ester and a 3′-phosphoramidite derivative of the nucleoside derivative and substrate solutions thereof. A polynucleotide is produced using the 5′-phosphate ester or 3′-phosphoramidite derivative of the nucleoside derivative. A library of the produced polynucleotide is used in a method of selecting a nucleic acid aptamer. Further provided is a vesicular endothelial growth factor binding agent of formula (i).
所公开的是式 (I-1) 的核苷衍
生物或其盐:
其中R1、R2、R3、R5、A1至A3、B、X、Y和k如本文所述。还提供了核苷衍
生物的5′-
磷酸酯和3′-亚
磷酰胺衍
生物及其底物溶液。使用核苷衍
生物的 5′-
磷酸酯或 3′-亚
磷酰胺衍
生物生产多核苷酸。生产的多核苷酸文库可用于选择核酸适
配体的方法。进一步提供了一种式(i)的
水泡内皮生长因子结合剂。