[{"from": "human", "value": "Describe this molecule. [C][N][C][=N][C][=Branch1][=C][=C][Ring1][Branch1][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][S]"}, {"from": "gpt", "value": "The molecule is a L-histidine derivative that is L-histidine substituted at positions N3 and C5 on the imidazole ring by methyl and mercapto groups respectively. It has a role as an antioxidant, a marine metabolite and a radical scavenger. It is an aryl thiol, a L-histidine derivative and a non-proteinogenic L-alpha-amino acid. It is a tautomer of an ovothiol A zwitterion."}]