The molecule is a thiamine phosphate having a 1-hydroxyethyl substituent at the 2-position on the thiazolium ring and an O-diphosphate moiety. It is a thiamine phosphate and a 1,3-thiazolium cation. It is a conjugate acid of a 2-(1-hydroxyethyl)thiamine diphosphate(2-).
2-[3-[(4-amino-2-methylpyrimidin-5-yl)methyl]-2-(1-hydroxyethyl)-4-methyl-1,3-thiazol-3-ium-5-yl]ethyl phosphono hydrogen phosphate