The property of a compound or material to selectively allow certain ions to pass through while blocking others based on their size, charge, and coordination chemistry.
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Ethanol, 2,2'-[[2-[(2-methoxyphenyl)methyl]-1,3-propanediyl]bis(oxy)]bis-
5,11,17,23-tetrakis(1,1-dimethylethyl)-25,27-dihydroxycalix[4]arene-crown-6
