Renée Szostek’s favorite structure is:

Hexamethylbenzene

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Source: Wikipedia

Why?

One of my favorite X-ray crystalline structures is hexamethylbenzene, which Kathleen Lonsdale first elucidated in 1928. Her X-ray crystalline structure showed that benzene possesses hexagonal symmetry and that it is a flat molecule. In addition, her structure showed that aliphatic C-C bonds and aromatic C-C bonds differ considerably in their length. The idea of differences in bond length contributed to the idea of resonance in chemical bonds, which, in turn, led to significant advances in chemistry.  —Renée Szostek

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