The molecule is the L-alpha-amino acid that is spermidine (1,5,10-triazadecane) carboxylated with S-configuration at the 2-position. It is a conjugate base of a carboxyspermidine(2+). It derives from a hydride of a spermidine.
(2S)-2-amino-5-(3-aminopropylamino)pentanoic acid