t-Boc-N-amido-PEG-OH (tBoc-NH-PEG-OH), MW 5K is a heterobifunctional PEG derivative containing a hydroxyl group at one end and a Boc-protected amine at the other end. It is a useful crosslinker with a PEG spacer.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.