SMILES: C[N+](C)(C)[C@@H](CCC1=NC=C(N1)C[C@@H](C(=O)O)N)C(=O)O
Description: The molecule is a quaternary ammonium ion consisting of L-histidine with a 3-(trimethylammonio)-3-carboxypropyl group at the 2-position of the the imidazole ring. It is a conjugate acid of a diphthinate.