1-Hydroxy-5-oxo-5H-pyrido(3,2-a)phenoxazine-3-carboxylic acid 1043-21-6 51410-30-1 5H-Pyrido(3,2-a)phenoxazine-3-carboxylic acid, 1-hydroxy-5-oxo- Catalin EINECS 213-872-4 Pirenoxina [Spanish] Pirenoxine Pirenoxine [INN:JAN] Pirenoxinum [Latin]