t-Boc-N-amido-PEG-OH (tBoc-NH-PEG-OH), MW 2K is a heterofunctional PEG molecule containing an amino protecting group. The t-boc protecting group can be removed using HCl or TFA to generate the free amine, which can then be reacted with the NHS ester or carboxyl group in the presence of an activator such as HATU or EDC.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.