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Potassium(I) with 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate (L) assembles to K(H 2 O)L (L = 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate). It was characterized by single-crystal X-ray diffraction, element analysis, IR and 1 H NMR spectroscopy. It crystallizes in the monoclinic space group P2 1 /n and reveals a seven-coordinate complex. Polyhedra potassium chains, C-H···π and C-H···O and O-H···O hydrogen bonds lead K(H 2 O)L to a three-dimensional network structure. The biological activity of resistance to hypoxia was tested, and the results showed that the biological activity of resistance to hypoxia of K(H 2 O)L is as good as that of its precursor, irisolidone.

Structure and Biological Activity of K(H2O)L (L = 5,7-Dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate)