3,5-Difluoropyridine71902-33-531 % similar 2-(4-Fluorophenyl)pyridine58861-53-330 % similar 3-Chloro-6-iodopyridazine135034-10-530 % similar 6-Iodopyridazin-3-amine187973-60-030 % similar 2,4-Difluoropyridine34941-90-730 % similar