[OH-:1].[Na+].[OH:3][C:4]1[C:13]2[C:8](=[CH:9][CH:10]=[C:11](OC)[CH:12]=2)[O:7][C:6](=[O:16])[C:5]=1[N+]([O-])=O>O>[OH2:3].[OH:3][C:4]1[C:13]2[C:8](=[CH:9][C:10]([OH:1])=[CH:11][CH:12]=2)[O:7][C:6](=[O:16])[CH:5]=1Dilute sodium hydroxide solution was added to a suspension of 4-hydroxy-6-methoxy-3-nitrocoumarin (2.0g) in water (40 ml) till the pH of the solution reached 14. Filtration gave the product m.p. 277°-8°(d); (C10H6NO6Na requires C, 46.35; H, 2.33; N, 5.41; Na, 8.87. Found: C, 46.32; H, 2.44; N, 5.50; Na, 8.34) after washing briefly with water and drying under vacuum.
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