  == IUPAC name ==  The IUPAC name is listed as '[(4-formyl-5-hydroxy-6-methylpyridin-3-yl)methoxy]phosphonic acid', which (obviously) seems wrong to me, and according to the structure depicted. Said structure clearly depicts an X-methyl phosphate and not an X-methoxy phosphonic acid, since it does not contain any C-P bond. Please note, I am no expert on the topical biochemistry. I am, however, certain about the chemical nomenclature, even though http://www.chemicalize.org/structure/#!mol=pyridoxal+phosphate&source;=fp agrees with the given name. Sadly.   