(R)-7-(But-2-yn-1-yl)-8-(3-((7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)amino)piperidin-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione; 7-(But-2-yn-1-yl)-8-((3R)-3-((3-(but-2-yn-1-yl)-7-methyl-5-((4-methylquinazolin-2-yl)methyl)-4,6-dioxo-4,5,6,7-tetrahydro-3H-imidazo[4,5-c]pyridin-2-yl)amino)piperidin-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione
