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Figure 2 One of the three sugar units, A, with all its sodium ion contacts and hydrogen bond interactions (dashed double lines). The atom numbering scheme is shown; the atoms of the other molecules are numbered correspondingly, with C, O and S atom numbers n+10 and n+20. The water molecules are labelled O31, O32 and O33. Symmetry codes: (i) x − , −y + , −z + 1; (ii) x + , −y + , −z + 1; (iii) x + , −y + , −z + 1; (iv) x − , −y + , −z + 1; (v) −x, y + , −z + ; (vi) −x + 1, y − , −z + ; (vii) −x + , −y + 1, z − ; (ix) −x, y − , −z + ; (xii) x − 1, y, z; (xiii) x + 1, y, z; (xiv) −x + 1, y + , −z + ; (xv) −x + , −y + 1, z + . |