3-Bromo-1H-pyrrolo[2,3-c]pyridine-4-carboxylic acid
6-Chloro-8-fluoroimidazo[1,2-a]pyridine
5-Bromo-4-chloro-2-iodo-1H-pyrrolo[2,3-b]pyridine
2-Formyl-4-nitropyridine 1-oxide
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