The WebWare Molecules for July are from the paper Modern Sport and Chemistry: What a Chemically Aware Sports Fanatic Should Know by Giffin, Boone, Cole, McKay and Kopitzke. One of them, the monomer of Kevlar, is shown below. The "free valences" at the terminal N and C atoms are the sites of polymerization (depicted as bromine in the Chime representation).
Figure. Kevlar monomer, a featured molecule of July 2002. Interactive Chime-based structure (top); static structure graphic (bottom)
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