has role has role is conjugate base of is deprotonated form of is tautomer of is tautomer of ergothioneine(1+) antioxidant amino-acid betaine sulfur-containing amino acid chelator ergothioneine L-ergothioneine chebi_ontology thiolhistidinebetaine CHEBI:4828 ergothionine (2S)-3-(2-mercapto-1H-imidazol-5-yl)-2-(trimethylammonio)propanoate 2-mercaptohistidine trimethylbetaine (alphaS)-alpha-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-1H-imidazole-4-ethanaminium inner salt sympectothion thiolhistidine-betaine A <small>L</small>-histidine derivative that is <em>N</em><small>^α</small>,<em>N</em><small>^α</small>,<em>N</em><small>^α</small>-trimethyl-<small>L</small>-histidine in which the hydrogen at position 2 on the imdazole ring is replaced by a mercapto group. A naturally occurring metabolite of histidine synthesized by bacteria and fungi with antioxidant properties. It is found ubiquitously in plants and animals and is present in many human foodstuffs. 3-(2-sulfanylidene-1,3-dihydroimidazol-4-yl)-2-trimethylammonio-propanoate (S)-(1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl)trimethylammonium hydroxide erythrothioneine L-thioneine xenobiotic metabolite plant metabolite fungal metabolite ergothioneine thione form L-histidine derivative