dipotassium 3-[3-carbamoyl-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-pyridylazo]phenylphosphonate

1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-5-[[3-[bis(potassiooxy)phosphinyl]phenyl]azo]-3-pyridinecarboxamide