2,2-dimethylthiopropionic acid S-(2-((4-(3-(6-(3,5-dimethylbenzyl)-5-ethyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethoxy)propenyl)phenoxy)-(5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-2,5-dihydrofuran-2-ylmethoxy)phosphoryloxy)ethyl) ester