63221-68-1 Butanoic acid, 4-(((3-hydroxy-2-methyl-5-((phosphonooxy)methyl)-4-pyridinyl)methylene)amino)- GABA-pyridoxal phosphate Pyridoxal phosphate GABA Pyridoxal phosphate gamma-aminobutyrate Pyridoxal phosphate gamma-aminobutyric acid