6-Chloro-1H-imidazo[4,5-b]pyridine
7-Bromo-3-iodo-1H-pyrrolo[2,3-c]pyridine
7-Chloropyrido[2,3-d]pyrimidine-2,4(1H,3H)-dione
4-Bromo-5-fluoro-1-methylpyridin-2(1H)-one
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