What are spherands? Give their characteristics. Also draw the structure of a spherand.
Spherands are a class of cyclic molecules in supramolecular chemistry that are designed to encapsulate metal ions or small molecules within a cavity. These molecules are a subset of the broader category of host molecules known as cryptands, but with a more rigid and spherical geometry. Spherands consist of a cyclic framework that includes functional groups like oxygen, nitrogen, or sulfur, which provide coordination sites for the ______ _______ __________ _______ _________ __________ ________ ______ _____.
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(2) 
What are spherands? Give their characteristics. Also draw the structure of a spherand.
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