thiamine(1+) vitamin B1 vitamin B1 thiamine(2+) +2 3-[(4-azaniumyl-2-methylpyrimidin-5-yl)methyl]-5-(2-hydroxyethyl)-4-methyl-1,3-thiazol-3-ium 3-[(4-ammonio-2-methylpyrimidin-5-yl)methyl]-5-(2-hydroxyethyl)-4-methyl-1,3-thiazol-3-ium thiamine dication 266.11904 Chemspider:2620140 InChI=1S/C12H17N4OS/c1-8-11(3-4-17)18-7-16(8)6-10-5-14-9(2)15-12(10)13/h5,7,17H,3-4,6H2,1-2H3,(H2,13,14,15)/q+1/p+1 A primary ammonium ion that is the conjugate acid of thiamine(1+) resulting from the protonation of the primary amino group. CHEBI:49107 Beilstein:3627364 266.36368 Gmelin:677220 Cc1ncc(C[n+]2csc(CCO)c2C)c([NH3+])n1 C12H18N4OS chebi_ontology JZRWCGZRTZMZEH-UHFFFAOYSA-O primary ammonium ion