(3-((5-(AMINOCARBONYL)-1-ETHYL-1,6-DIHYDRO-2-HYDROXY-4-METHYL-6-OXOPYRIDIN-3-YL)AZO)PHENYL)PHOSPHONIC ACID
(3-((5-(aminocarbonyl)-1-ethyl-1,6-dihydro-2-hydroxy-4-methyl-6-oxopyridin-3-yl)azo)phenyl)phosphonic acid