This compound, known as Fmoc-1,3-diaminopropane hydrochloride, is a protected derivative of 1,3-diaminopropane where one amino group is shielded by the fluorenylmethyloxycarbonyl (Fmoc) protecting group, and the other is present as a hydrochloride salt. It functions as a key building block in organic synthesis, especially in peptide chemistry and the development of pharmaceuticals and biologically active compounds. The selective protection enables precise control over reactions, allowing incorporation of the propylenediamine moiety into complex structures during solid-phase peptide synthesis (SPPS) or solution-phase methods. The Fmoc group is stable under acidic conditions but can be selectively removed under mild basic conditions, facilitating orthogonal deprotection strategies essential for multistep syntheses.