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I want to determine the cavity radius/ dia of crown ether. Which technique should I follow?

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    $\begingroup$ Knowing the crystal structure and van der Waals radii of the atoms forming the cavity it's a matter of finding distance between two points in 3D space. Many molecular editors and crystal structure software such as Avogadro or Mercury can do that via a couple of mouse clicks. $\endgroup$ – andselisk Feb 18 '18 at 9:43

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