Fmoc NH PEG Amine (FMOC-NH-PEG-NH2) is a heterobifunctional PEG derivative with an Fmoc protected amine, which has a free amine group. It is often used as a crosslinker or as a spacer between two different chemical entities. The PEG moiety in the heterobifunctional PEG derivatives provides water solubility, biocompatibility, and flexibility. Applied in medical research, drug release, nanotechnology and new material research, cell culture. Active compounds in research ligands, peptide synthesis support, grafted polymer compounds, new materials and polyethylene glycol modified functional coatings.