[Br-:10].[Br:1][c:2]1[cH:3][cH:4][c:5]([CH:6]=[O:7])[cH:8][cH:9]1.[CH:11]([CH3:12])([CH3:13])[Mg+:14].[O:15]1[CH2:16][CH2:17][CH2:18][CH2:19]1>>[Br:1][c:2]1[cH:3][cH:4][c:5]([CH:6]([OH:7])[CH:11]([CH3:12])[CH3:13])[cH:8][cH:9]1
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