The molecule is the non-proteinogenic L-alpha-amino acid that is norspermidine (1,5,9-triazanonane) carboxylated with S-configuration at the 2-position. It is a conjugate base of a carboxynorspermidine(2+). It derives from a hydride of a bis(3-aminopropyl)amine.
(2S)-2-amino-4-(3-aminopropylamino)butanoic acid