This compound is an Fmoc-protected amino acid derivative, specifically 2-(2-(Fmoc-amino)ethoxy)acetic acid, used as a building block in peptide synthesis. The Fmoc group temporarily protects the amino functionality, enabling controlled stepwise assembly of peptide chains in solid-phase peptide synthesis (SPPS). It introduces a hydrophilic ethylene glycol spacer, enhancing solubility and flexibility in the resulting peptides or conjugates. This reagent is essential for producing complex peptides, peptidomimetics, and bioconjugates in pharmaceutical research, drug development, and biochemical studies, where its stability under acidic and basic conditions supports high-yield syntheses.