4-anilino-1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one

methyl 2-[[1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-2-oxopyrimidin-4-yl]amino]acetate

5'-O-(4,4'-dimethoxytrityl)-2,2'-O-anhydro-1-(β-D-arabinofuranosyl)uracil 3'-O-trichloroacetimidate