I[CH2:2][CH2:3][CH2:4][CH3:5].[Br:6][C:7]1[CH:8]=[CH:9][C:10]([OH:30])=[C:11]([CH:29]=1)[CH2:12][N:13]([C:16]1[N:21]=[N:20][C:19]([C:22]([O:24][CH2:25][CH2:26][CH2:27][CH3:28])=[O:23])=[CH:18][CH:17]=1)[CH2:14][CH3:15]>>[Br:6][C:7]1[CH:8]=[CH:9][C:10]([O:30][CH2:2][CH2:3][CH2:4][CH3:5])=[C:11]([CH:29]=1)[CH2:12][N:13]([C:16]1[N:21]=[N:20][C:19]([C:22]([O:24][CH2:25][CH2:26][CH2:27][CH3:28])=[O:23])=[CH:18][CH:17]=1)[CH2:14][CH3:15]The title compound was prepared by reacting 1-iodobutane and butyl 6-[N-(5-bromo-2-hydroxybenzyl)-N-ethylamino]pyridazine-3-carboxylate using a similar method to that of reference example 4.
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