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2-Pyrone-4,6-dicarboxylic acid (PDC), a chemically stable metabolic intermediate of lignin, showed preferential Cs+ sedimentation even from the aqueous solutions containing other alkali metal ions, such as Na+. From the crystal structure of the Cs+/PDC complex, Cs+ was revealed to be coordinated by 10 oxygen atoms of PDC and such multiple coordination was the reason of the preferential complex formation of Cs+ with PDC.doi:10.6084/m9.figshare.3142066 fatcat:nm7gaum5pbbqjdrc3fnwuiobly