3'-S-(2-Cyanoethyl-N,N-diisopropylphosphorothioamidite)- 3'-deoxy-5'-O-(4,4'-dimethoxytrityl)thymidine
3'-s-(2-cyanoethyl-n,n-diisopropylphosphorothioamidite)- 3'-deoxy-5'-o-(4,4'-dimethoxytrityl)thymidine