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1-Hydroxy-3-carboxy-5H-pyrido[3,2-a]phenoxazin-5-one 1-Hydroxy-5H-pyrido[3,2-a]phenoxazin-5-one-3-carboxylic acid; Catalin; Catalin (pharmaceutical); Catalin K; Clarvisan; HPPC; Kary-Uni; Pirfenoxone; Pyrphenoxone CAS 1043-21-6 PubChem CID 4846
O=C(O)c1cc(=O)c2c3nc4ccccc4oc-3cc(=O)c2[nH]1