Bis-PE21- NHS ester

Bis-PEG9-NHS ester is a PEG linker containing two NHS ester groups. The hydrophilic PEG spacer increases solubility in aqueous media. The NHS ester can be used to label the primary amines (-NH2) of proteins, amine-modified oligonucleotides, and other amine-containing molecules.

Bis(2,5-dioxopyrrolidin-1-yl) 4,7,10,13,16,19,22,25,28-Nonaoxahentriacontane-1,31-dioate is a protein crosslinking agent.