尿嘧啶核苷

5-(羟甲基)-2',3'-O-(异丙亚基)尿苷

5-甲基尿甙

5'-O-tert-butyldiphenylsilyl-5-hydroxymethyl-2',3'-O-isopropylideneuridine

3',5'-di-O-acetyl-2'-bromo-2'-deoxy-5-acetoxymethyl-uridine