2-amino-N-((2S,3S,5R)-2-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-3-yl)acetamide

N-(thymidin-5'-yl)-N'-[5'-O-(4,4'-dimethoxytrityl)thymidin-3'-yl]-3,4-dioxocyclobuten-1,2-diamine