1-Hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylic acid sodium salt 1043-21-6 51410-30-1 5H-Pyrido(3,2-a)phenoxazine-3-carboxylic acid, 1-hydroxy-5-oxo-, monosodium salt Catalin sodium EINECS 257-181-6 Pirenoxine sodium salt Sodium 1-hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylate