2,5-Dioxopyrrolidin-1-yl 3-(2-methoxyethoxy)propanoate

m-PEG2-NHS ester is a PEG linker containing 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 hydrophilic PEG spacer increases solubility in aqueous media.