1 R6D 6-(6-aminopyrazin-2-yl)-N-{4-[4-(oxetan-3-yl)piperazin-1-yl]phenyl}imidazo[1,2-a]pyrazin-8-amine 1.000 2 ASH 3-chloro-N-(4-morpholin-4-ylphenyl)-6-pyridin-3-ylimidazo[1,2-a]pyrazin-8-amine 0.722