2105-43-3 804-30-8 EINECS 218-278-9 N-((4-Amino-2-methylpyrimidin-5-yl)methyl)-N-(4-hydroxy-1-methyl-2-((tetrahydrofurfuryl)dithio)but-1-en-1-yl)formamide monohydrochloride Thiamine tetrahydrofurfuryl disulfide hydrochloride