Pentafluoropyridine

2,3,5,6-tetrachloro-4-methylsulfonylpyridine

6-chloropyridine-2-carbonitrile

3,6-Difluoropyridine-2-carboxylic acid

2,2'-bipyridine

 2-Chloro-4'-fluoroacetophenone

 2-Chloro-2',4'-difluoroacetophenone

2-FLUORO-3-NITROBENZOIC ACID