The molecule is a thiamine phosphate. It is a conjugate base of a thiamine(1+) monophosphate. It is a conjugate acid of a thiamine(1+) monophosphate(2-).
2-[3-[(4-amino-2-methylpyrimidin-5-yl)methyl]-4-methyl-1,3-thiazol-3-ium-5-yl]ethyl hydrogen phosphate