4-Chloro-1H-pyrazolo[3,4-b]pyridine
5-Bromo-3-methyl-1H-pyrazolo[3,4-b]pyridine
5-Bromo-2-methyl-2H-pyrazolo[3,4-b]pyridine
5-Bromo-1-methyl-1H-pyrazolo[3,4-b]pyridine
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