3'-O-((2-cyanoethyl)(diisopropylamino))phosphino-5'-O-(4,4'-dimethoxytrityl)-2'-deoxy-2'-S-hexyluridine
3'-o-((2-cyanoethyl)(diisopropylamino))phosphino-5'-o-(4,4'-dimethoxytrityl)-2'-deoxy-2'-s-hexyluridine