The molecule is the alpha-amino-acid cation formed from carboxyspermidine by zwitterion formation between the carboxy and alpha-amino groups and protonation of the nitrogen atoms at positions 5 and 10; the major structure of carboxyspermidine at pH 7.3. It is a conjugate acid of a carboxyspermidine.
(2S)-2-azaniumyl-4-(4-azaniumylbutylazaniumyl)butanoate