O,O'-bis-(2',3'-O-isopropylidene-5'-uridyl) iminodicarboxylate

(2',3'-O-isopropylidene-5'-uridyl) 4-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)allophanate

[4-(2,4-dioxopyrimidin-1-yl)-2,2-dimethyl-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxol-6-yl]methyl carbamate