Tropylium cation

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What Wikipedia says

The tropylium ion or cycloheptatrienyl cation is an aromatic species with a formula of [C7H7]+. Its name derives from the molecule tropine from which cycloheptatriene (tropylidene) was first synthesized in 1881.

Excerpt from the Wikipedia article “Tropylium cation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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