N'-[9-[(2R,4S,5S)-5-[[2-cyanoethoxy-(diisopropylamino)phosphanyl]oxymethyl]-4-(tritylamino)tetrahydrofuran-2-yl]purin-6-yl]-N,N-dimethyl-formamidine

N'-[9-[5-[[2-cyanoethoxy-[di(propan-2-yl)amino]phosphanyl]oxymethyl]-4-(tritylamino)oxolan-2-yl]purin-6-yl]-N,N-dimethylmethanimidamide

GYBKIQYITQGOTA-UHFFFAOYSA-N

CC(C)N(C(C)C)P(OCCC#N)OCC1C(CC(O1)N2C=NC3=C(N=CN=C32)N=CN(C)C)NC(C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6