Phosphoricacid, monomethyl ester, 5-ester with pyridoxal (8CI) Pyridoxal 5'-phosphate monomethyl ester Pyridoxal, 5-(methylhydrogen phosphate) (8CI) Pyridoxalphosphate monomethyl ester Phosphoric acid,mono[(4-formyl-5-hydroxy-6-methyl-3-pyridinyl)methyl] monomethyl ester methyl pyridoxal 5-phosphate (MePLP)