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Boron trichloride

Boron trifluoride

Boron trifluoride-acetic acid complex

5-Bromo-2-hydroxypyrimidine

3-Bromo-2-hydroxypyridine

2-Bromo-3-hydroxypyridine

3-Bromo-4-hydroxypyridine

3-Bromo-5-hydroxypyridine