1 507 1-{3-[6-(tetrahydro-2h-pyran-4-ylamino)imidazo[1,2-B]pyridazin-3-yl]phenyl}ethanone 1.000 2 VX2 N-cyclohexyl-3-[3-(trifluoromethyl)phenyl][1,2,4]triazolo[4,3-B]pyridazin-6-amine 0.700