Isatin → 1-(diphenylmethyl)-5-methyl-1H-indole-2,3-dione

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[Br:24][CH2:25][CH2:26][CH:27]1[CH2:28][CH2:29]1.[Br:30][CH:31]([c:32]1[cH:33][cH:34][cH:35][cH:36][cH:37]1)[c:38]1[cH:39][cH:40][cH:41][cH:42][cH:43]1.[CH3:12][c:13]1[cH:14][c:15]2[c:19]([cH:20][cH:21]1)[NH:18][C:17](=[O:22])[C:16]2=[O:23].[O:1]=[C:2]1[C:3](=[O:4])[c:5]2[c:6]([cH:7][cH:8][cH:9][cH:10]2)[NH:11]1>>[CH3:12][c:13]1[cH:14][c:15]2[c:19]([cH:20][cH:21]1)[N:18]([CH:31]([c:32]1[cH:33][cH:34][cH:35][cH:36][cH:37]1)[c:38]1[cH:39][cH:40][cH:41][cH:42][cH:43]1)[C:17](=[O:22])[C:16]2=[O:23]