SMILES: C[NH2+]C(CCC1=NC=C(N1)C[C@@H](C(=O)O)N)C(=O)O
Description: The molecule is an ammonium ion that is a derivative of L-histidine having a 3-carboxy-3-(methylammonio)propyl group at the 2-position on the imidazole ring. It is a conjugate acid of a 2-[3-carboxylato-3-(methylammonio)propyl]-L-histidine dizwitterion.