2-(3-amino-3-carboxypropyl)-L-histidine zwitterion residue
2-(3-amino-3-carboxypropyl)-l-histidine zwitterion residue
A zwitterionic group obtained by transfer of a proton from the amino to the carboxy group of 2-(3-amino-3-carboxypropyl)-<small>L</small>-histidine residue.