Fmoc-6-aminohexanoic acid is widely used in peptide synthesis as a building block. It serves as a spacer or linker molecule, enabling the attachment of functional groups or protecting groups to peptides. This compound is particularly valuable in solid-phase peptide synthesis (SPPS) due to its Fmoc (fluorenylmethyloxycarbonyl) protecting group, which can be easily removed under mild basic conditions. It is also utilized in the development of peptide-based drugs, biomaterials, and bioconjugates, where precise control over molecular structure is essential. Additionally, it finds applications in the synthesis of peptide nucleic acids (PNAs) and other modified peptides for research and therapeutic purposes.