1H-Imidazole-4-ethanaminium, .alpha.-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-, hydroxide, inner salt, monohydrochloride, (S)- 6072-08-8 Ammonium, [1-carboxy-2-(2-mercaptoimidazol-4-yl)ethyl]trimethyl-, hydroxide, inner salt, hydrochloride, stereoisomer L-Ergothionine hydrochloride NSC118378 Usaf B-26