N-(t-butyl ester-PEG2)-N-bis(PEG3-azide) is a branched biotin probe with an azide group and a methyl ester terminal group. The azide group undergoes click chemistry to conjugate alkyne bearing biomolecules. The methyl group can be easily removed to form a free acid that can be used for bioconjugation with amine-containing molecules.
AxisPharm offers 4000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.