[OH-].[Na+:2].[CH:3]1[N:7]2[C:8]3[C:13]([N:14]=[CH:15][C:6]2=[N:5][C:4]=1[C:16]([OH:18])=[O:17])=[CH:12][CH:11]=[CH:10][CH:9]=3.CC(C)=O>O>[CH:3]1[N:7]2[C:8]3[C:13]([N:14]=[CH:15][C:6]2=[N:5][C:4]=1[C:16]([O-:18])=[O:17])=[CH:12][CH:11]=[CH:10][CH:9]=3.[Na+:2]Aqueous 2 N sodium hydroxide solution was added dropwise to a stirred suspension of 2 g of imidazo-[1,2-a]-quinoxaline-2-carboxylic acid in 20 ml of water until dissolution occured at a pH of 9-10. Acetone was added to the mixture to cause precipitation and the mixture was filtered to obtain 1.8 g of sodium imidazo-[1,2-a]-quinoxaline-2-carboxylate melting at >300° C.
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