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5-Iodopyridine-2-carboxylic acid

4-Iodopyridine-2,6-dicarboxylic acid

2-Mercaptobenzooxazole-5-carboxylic acid

3-Mercapto-6-methylpyridazine

2-Mercapto-4-methylpyridine

2-Mercaptopyridine-4-carboxylic acid

3-Mercaptopyridine-4-carboxylic acid

4-Mercaptopyridine-2-carboxylic acid

4-Mercaptopyridine-3-carboxylic acid

5-Mercaptopyridine-2-carboxylic acid