SMILES: C[N+](C)(C)[C@@H](CCC1=NC=C(N1)C[C@@H](C(=O)O)N)C(=O)N
Description: The molecule is a quaternary ammonium ion that is the derivative of L-histidine having a 4-amino-4-oxo-3-(trimethylammonio)butyl group at the 2-position of the imidazole ring. It is a tautomer of a diphthamide zwitterion.