4-[4-[2-(3,4-difluorophenyl)ethyl]piperazin-1-yl]-2-pyridin-4-yl-6,7,8,9-tetrahydropyrimido[6,5-b]indolizine-10-carbonitrile
4-[4-[2-(3,4-difluorophenyl)ethyl]piperazin-1-yl]-2-(4-pyridyl)-6,7,8,9-tetrahydropyrimido[6,5-b]indolizine-10-carbonitrile
4-[4-[2-(3,4-difluorophenyl)ethyl]-1-piperazinyl]-2-(4-pyridyl)-6,7,8,9-tetrahydropyrimido[6,5-b]indolizine-10-carbonitrile