118867-43-9 5'-O-(4,4'-Dimethoxytriphenylmethyl)dithymidyl (3',5')-4,4'-dimethoxytriphenylmethanephosphonate Dmt-tdmtt Thymidine, P-(bis(4-methoxyphenyl)phenylmethyl)-p-deoxythymidylyl-(5'-3')-5'-O-(bis(4-methoxyphenyl)phenylmethyl)-