1H-Imidazole-4-ethanaminium, alpha-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-, hydroxide, inner salt, monohydrochloride, (S)- (9CI) 6072-08-8 Ammonium, (1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl)trimethyl-, hydroxide, inner salt, hydrochloride, stereoisomer (8CI) NSC 118378 USAF B-26 l-Ergothionine hydrochloride