[Cl:1][C:2]1[C:7]([CH:8]=[O:9])=[CH:6][CH:5]=[C:4]([Cl:10])[N:3]=1.[Cl:11]C1C(CCl)=CC(Cl)=C(Cl)N=1>>[Cl:1][C:2]1[C:7]([CH:8]=[O:9])=[CH:6][C:5]([Cl:11])=[C:4]([Cl:10])[N:3]=1Obtained analogously to the process described for 2,6-dichloropyridine-3-aldehyde, using 2,5,6-trichloro-3-chloromethylpyridine instead of 2,6-dichloro-3-chloromethylpyridine.
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