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Figure 2 Molecular packing of racemic uridine units. The dimeric units of opposite chirality, (2′R*,6R'*,8′R*)- and (2′S*,6′S*,8′S*)-uridines are connected to each other by intermolecular hydrogen bonds. Dashed lines represent hydrogen bonds. Most hydrogen atoms that are not involved in hydrogen bonding, have been omitted for clarity. The origin of the unit cell is labelled as O while cell axes are labelled as a (red), b (green) and c (blue), respectively. [Symmetry code: (ii) 1/2-x, − + y, 1/2-z; (iii) + x, 3/2-y, + z; (iv) −x + 1, −y + 1, −z + 1.] |