NPC-PEG-NPC, MW 2K is a linear bifunctional PEG cross-linker containing two reactive nitrophenyl carbonates that can be used to modify proteins, peptides or any other surface with a lysine residue or N-terminus. Amino available. Easily reacts with amine groups at pH values of 6.5 to 9.5, and has applications in medical research, drug release, nanotechnology and new material research, cell culture.