6-Bromo-1H-pyrazolo[4,3-b]pyridine
3-Amino-5-fluoro-1H-pyrazolo[3,4-b]pyridine
3-CHLORO-1H-PYRAZOLO[3,4-B]PYRIDINE
5-Chloro-1H-pyrazolo[4,3-b]pyridine
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