Potassium Cation → Istradefylline Impurity 2

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[C:28](=[O:29])([O-:30])[O-:31].[CH3:1][O:2][c:3]1[cH:4][c:5]([CH:6]=[CH:7][c:8]2[n:9][c:10]3[n:11]([CH2:21][CH3:22])[c:12](=[O:20])[n:13]([CH2:18][CH3:19])[c:14](=[O:17])[c:15]3[nH:16]2)[cH:23][cH:24][c:25]1[O:26][CH3:27].[CH3:34][I:35].[CH3:36][N:37]([CH3:38])[CH:39]=[O:40].[K+:32].[K+:33]>>[CH3:1][O:2][c:3]1[cH:4][c:5]([CH:6]=[CH:7][c:8]2[n:9][c:10]3[n:11]([CH2:21][CH3:22])[c:12](=[O:20])[n:13]([CH2:18][CH3:19])[c:14](=[O:17])[c:15]3[n:16]2[CH3:28])[cH:23][cH:24][c:25]1[O:26][CH3:27]