Acetone → Methyl 7-ethoxy-9-oxo-9H-xanthene-3-carboxylate

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[C:24](=[O:25])([O-:26])[O-:27].[CH2:21]([CH3:22])[I:23].[CH3:30][C:31](=[O:32])[CH3:33].[K+:28].[K+:29].[OH:1][c:2]1[cH:3][cH:4][c:5]2[o:6][c:7]3[cH:8][c:9]([C:17](=[O:18])[O:19][CH3:20])[cH:10][cH:11][c:12]3[c:13](=[O:16])[c:14]2[cH:15]1>>[O:1]([c:2]1[cH:3][cH:4][c:5]2[o:6][c:7]3[cH:8][c:9]([C:17](=[O:18])[O:19][CH3:20])[cH:10][cH:11][c:12]3[c:13](=[O:16])[c:14]2[cH:15]1)[CH2:21][CH3:22]