Catenane

A catenane is a mechanically-interlocked molecular architecture consisting of two or more interlocked macrocycles. The interlocked rings cannot be separated without breaking the covalent bonds of the macrocycles. Catenane is derived from the Latin catena meaning `chain`. They are conceptually related to other mechanically interlocked molecular a.....
Found on http://en.wikipedia.org/wiki/Catenane

Catenane

Two or more interlocking rings.
Found on http://www.encyclo.co.uk/local/20741
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