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The reaction of anthracene with maleic anhydride is a classic example of a Diels-Alder reaction. Anthracene acts as the diene and maleic anhydride as the dienophile. The reaction proceeds via a concerted mechanism, forming a new six-membered ring, resulting in a product known as 9,10-dihydroanthracene-9,10-endo-α,β-succinic anhydride.