5-马来酰亚胺基戊酸琥珀酰亚胺酯包含马来酰亚胺基团和NHS酯。NHS酯可用于标记蛋白质的伯胺（-NH2）、胺修饰的寡核苷酸和其他含胺分子。马来酰亚胺基团将与硫醇基团反应形成共价键，使生物分子能够与硫醇连接。 5-Maleimido-pentanoic NHS ester contains a maleimide group and an NHS ester. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules. The maleimide group will react with a thiol group to form a covalent bond, enabling the connection of biomolecule with a thiol.