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from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry any of a class of compounds having five-membered
ring heterocycles (or theirbenzo derivatives) which possess asextet of π-electrons in association with theatoms comprising the ring, but which cannot be represented by any onecovalent orpolar structure ; typically the ring structure contains both positive and negativedelocalised charges which cannot be associated with any one ring atom, and the negative charge can also be associated with aconjugated exocyclic atom (typically oxygen, sulfur, or nitrogen).
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