(2-(4-Formyl-5-hydroxy-6-methyl-3-pyridinyl)ethyl)phosphonic acid 19730-75-7 5'-Deoxypyridoxal 5'-methylenephosphonic acid 5-CH2PLP Phosphonic acid, (2-(4-formyl-5-hydroxy-6-methyl-3-pyridinyl)ethyl)- Plp 5'-methylenephosphonic acid Plp 5'-mpa