Friedrich August Kekule von Stradonitz was a German organic and theoretical chemist, whose most famous work was determining the structure of benzene. The FDC features Kekule on the cachet, a postmark depicting the benzene ring, and a stamp featuring both Kekule and a benzene ring, with Kekule inside the ring.
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De Bast, Jean. “First Day Cover Commemorating August Kekule.” Belgium, September 7, 1966. Witco Stamp Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/n296wz188.
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