Biotin-PEG5-NH-Boc contains biotin and Boc protected amine moieties. The biotin group is used for the conjugation of proteins and can also be used for chemical labeling. Boc is acid labile, which produces a free amine upon removal which can be further reacted.
AxisPharm offers 4000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.