C[O:2][C:3]([CH2:5][N:6]1[C:15]2[CH2:14][CH2:13][CH2:12][C:11](=[O:16])[C:10]=2[CH:9]=[CH:8][C:7]1=[O:17])=[O:4]>[OH-].[Na+]>[C:3]([CH2:5][N:6]1[C:15]2[CH2:14][CH2:13][CH2:12][C:11](=[O:16])[C:10]=2[CH:9]=[CH:8][C:7]1=[O:17])([OH:4])=[O:2]Prepared by saponification from 1-methoxycarbonylmethyl-7,8-dihydro-2,5(1H,6H)-quinolinedione in 1 N sodium hydroxide solution at room temperature. The reaction mixture was adjusted to pH 2 after two hours and extracted with ethyl acetate.
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