Synonyms: 5H-Pyrido[3,2-a]phenoxazine-3-carboxylicacid, 1-hydroxy-5-oxo-, monosodium salt (9CI);Catalin sodium;Pirenoxinesodium;Pirfenoxone sodium salt;Sodium1-hydroxy-5-oxo-5H-pyrido[3,2-a]phenoxazine-3-carboxylate;sodium 1,5-dioxo-1,5-dihydro-4H-pyrido[3,2-a]phenoxazine-3-carboxylate;Pirenoxine sodium;1-Hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylic acid sodium salt;Pirenoxine sodium salt;Sodium 1-hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylate;