N-(Amide-Propargyl)-N-bis(m-PEG3), MW 40,000 - 250 MG

N-(Amide-Propargyl)-N-bis(m-PEG3), MW 40,000 is a PEG linker consisting of two mPEG spacers and a terminal alkyne joined together by a central tertiary amide. The propargyl group is a terminal alkyne which is used in copper click chemistry with azide groups to create a stable triazole linkage with a target molecule. The mPEG spacers are fairly inert structures which increase the aqueous solubility of the final conjugate.