Synonyms: 1H-Imidazole-4-ethanaminium,a-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-,hydroxide, inner salt, (S)-;Ammonium,[1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl]trimethyl-, hydroxide, inner salt,L-(+)- (8CI);1H-Imidazole-4-ethanaminium, a-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-, innersalt, (S)-;2-Mercapto-N,N-dimethylhistidine methyl ester betaine;2-Mercaptohistidine betaine;2-Mercaptohistidine trimethylbetaine;Ergothioneine;