The molecule is an amino acid zwitterion obtained by transfer of protons from the amino to the carboxy groups of 2-[3-carboxy-3-(dimethylamino)propyl]-L-histidine. It is a tautomer of a 2-[3-carboxy-3-(dimethylamino)propyl]-L-histidine.
4-[5-[(2S)-2-azaniumyl-2-carboxylatoethyl]-1H-imidazol-2-yl]-2-(dimethylazaniumyl)butanoate