This compound, (9H-Fluoren-9-yl)methyl (2-aminoethyl)carbamate, is a specialized Fmoc-protected building block used in solid-phase peptide synthesis (SPPS) and organic synthesis of biomolecules. It features a free primary amino group on the ethyl chain, enabling selective coupling to growing peptide chains or other substrates via standard amide bond formation. The Fmoc group protects the adjacent carbamate moiety, providing orthogonality and stability under acidic and basic conditions typical of SPPS. Deprotection is achieved mildly with piperidine in DMF, preserving the integrity of the assembled structure. This reagent is particularly useful for incorporating ethylenediamine-based spacers or linkers in the synthesis of bioactive peptides, pharmaceutical conjugates, enzyme inhibitors, and research probes requiring precise control over reactivity and minimal side reactions.