(2,4-Bis-benzyloxy-phenoxymethyl)-phosphonic acid diethyl ester
[(S)-2-(tert-Butyl-diphenyl-silanyloxy)-1-((S)-2,2-dimethyl-[1,3]dioxolan-4-yl)-ethoxymethyl]-phosphonic acid diethyl ester
1-[2-deoxy-3-O-(diethylphosphono)methyl-5-O-(4-methoxytrityl)-α-D-erythro-pentofuranosyl]thymine
diethyl ((R)-1-(6-(tritylamino)-9H-purin-9-yl)-3-(trityloxy)propan-2-yloxy)methylphosphonate
diethyl ((S)-1-(6-(tritylamino)-9H-purin-9-yl)-3-(trityloxy)propan-2-yloxy)methylphosphonate