2-Bromo-3,5-difluoropyridine660425-16-130 % similar 3,5-Difluoropyridin-2-amine732306-31-930 % similar 3-Chloro-2,5-difluoropyridine851179-00-530 % similar 2,3-Dibromo-5-fluoropyridine878207-82-030 % similar