(2R,3S,5R)-2-((双(4-甲氧基苯基)(苯基)甲氧基)甲基)-5-(2-(((二甲基氨基)亚甲基)氨基)-4-氧代-1,4-二氢-7H-吡咯并[2,3-d]嘧啶-7-基)四氢呋喃-3-基 (2-氰基乙基) 二异丙基亚磷酰胺

(2R,3S,5R)-2-((Bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-5-(2-(((dimethylamino)methylene)amino)-4-oxo-1,4-dihydro-7H-pyrrolo[2,3-d]pyrimidin-7-yl)tetrahydrofuran-3-yl (2-cyanoethyl) diisopropylphosphoramidite