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Tosyl chloride 2-Bromo-4-nitroimidazole 2-Bromo-4-fluoropyridine 2-Bromo-5,6-diphenylpyrazine 2-Bromo-4-chloropyridine 2-Bromopyridine-4-carboxylic acid 5-Amino-2-bromo-3-methylpyridine 6-Bromopicolinic acid 2-Bromo-3-methyl-5-chloropyridine 2-Bromo-3-methyl-5-nitropyridine