[{"from": "human", "value": "Provide a brief overview of this molecule. [C][N+1][Branch1][C][C][Branch1][C][C][C@@H1][Branch1][N][C][C][=C][NH1+1][=C][Branch1][Ring2][N][Ring1][Branch1][S][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an alpha-amino-acid cation obtained by protonation of the imidazole ring of ergothioneine. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate acid of an ergothioneine."}]