126922-65-4 2'-Dimethyl-tert-butylsilyl-N(2)-(N,N-dimethylamino)methylene-guanosine 3',5'-cyclic diethylphosphoramidate 2-Tbdms-phosphoramidate Guanosine, N-((dimethylamino)methylene)-2'-O-((1,1-dimethylethyl)dimethylsilyl)-, cyclic 3',5'-(diethylphosphoramidate), (S)-