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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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A novel 1:1 complex of potassium mikanin-3-O-sulfate with methanol.

Mikanin-3-O-sulfate (1), in the form of its potassium salt, together with mikanin (2) and alpinetin (3) were isolated from Mikania micrantha. The crystal structures of K(1) x CH3OH, 2 and 3 x H2O were established by X-ray crystallography. The potassium ions in K(1) x CHO3H are bridged by O5, O7 and O8 to form a chain of face-sharing KO8 coordination polyhedra, from which the aglycon units are outstretched to form a polymeric molecular column. Adjacent molecular columns are linked by pi-pi stacking between parallel, intercalating aglycon units to form layers matching the (101) family of planes, which are further interconnected into a three-dimensional supramolecular assembly. Sulfation at 3-OH induced better co-planarity and conjugation of the rings.[1]

References

  1. A novel 1:1 complex of potassium mikanin-3-O-sulfate with methanol. Jiang, R.W., He, Z.D., But, P.P., Chan, Y.M., Ma, S.C., Mak, T.C. Chem. Pharm. Bull. (2001) [Pubmed]
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