N-[(4,6-dimethyl-2-oxo-1H-pyridin-3-yl)methyl]-2-({[4-({[(4,6-dimethyl-2-oxo-1H-pyridin-3-yl)methyl]amino}carbonyl)-5-ethyl-2-(hexahydropyridin-1-ylmethyl)-1-benzofuran-6-yl](3,4,5,6-tetrahydro-2H-pyran-4-yl)amino}methyl)-5-ethyl-6-(3,4,5,6-tetrahydro-2H-pyran-4-ylamino)-1-benzofuran-4-carboxamide