Pyrimidine,4-[2,2'-bipyridin]-6-yl-6-[6-[6-[6-[6-[6-(6-[2,2'-bipyridin]-6-yl-4-pyrimidinyl)-2-pyridinyl]-4-pyrimidinyl]-2-pyridinyl]-4-pyrimidinyl]-2-pyridinyl]-