1-[ (5E) -3-O-[ (Bis-di-isopropyl amino) (2-cyanoethoxy) phosphino]-5,6-dideoxy-6- (diethoxyphosphinyl) -2-O- (2-methoxyethyl) -β-D-ribo-hex-5-enofuranosyl]-5-methyluracil

This compound is a 5'-modified nucleoside phosphoramidite derivative, specifically a 5-methyluridine analog with a 2'-O-methoxyethyl and a 5'-phosphoramidite group. It serves as a critical building block in the automated solid-phase synthesis of modified oligonucleotides for antisense research and therapeutic development, both in vitro and in vivo.