134934-55-7 2'-Piperidino-5'-(4-methoxytrityl)-2',3'-dideoxyuridine 2'Pip-5'(4MeOTrityl)ddU AIDS-002328 AIDS002328 Uridine, 2',3'-dideoxy-5'-O-[(4-methoxyphenyl)diphenylmethyl]-2'-(1-piperidinyl)-