Fmoc-D-alaninol is a protected derivative of D-alaninol, featuring the Fmoc (9-fluorenylmethyloxycarbonyl) protecting group on the amino functionality. It serves as a key building block in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS), where it enables the incorporation of a reduced amino acid residue or hydroxyalkylamine moiety into peptide chains. The Fmoc group facilitates orthogonal protection strategies, allowing precise stepwise assembly of peptides while preventing unwanted side reactions. This compound is vital in pharmaceutical research for synthesizing peptide-based drugs, peptidomimetics, and bioactive molecules, as well as in biochemical studies exploring protein structures, enzyme mechanisms, and novel therapeutic agents.