| [[(2r,3s,4r,5r)-5-(4-amino-2-oxo-pyrimidin-1-yl)-3,4-dihydroxy-tetrahydrofuran-2-yl]oxy-hydroxy-phosphoryl] 2-[(2r,3s,4r,5r)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-tetrahydrofuran-2-yl]ethyl[(2r,3s,4r,5r)-5-(2,4-dioxopyrimidin-1-yl)-3,4-dihydroxy-tetra |
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