N-(Fmoc-N-amido-PEG4)-N-Biotin-PEG4-t-Boc-Hydrazide is a heterotrifunctional PEG linker containing Fmoc, biotin, and a Boc-protected hydrazide moieties.
AxisPharm offers 5000+ PEG Linkers with high purity. Different kinds of PEG Reagents may be available by custom synthesis.