1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-((3-phosphonophenyl)azo)-3-pyridinecarboxamide, dipotassium salt 70815-25-7 Dipotassium 3-(3-carbamoyl-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-pyridylazo)phenylphosphonate EINECS 274-909-8 Phosphonic acid, (3-((5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl)azo)phenyl)-, dipotassium salt