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  1. Heterocyclic compound - Wikipedia

  2. Heterocyclic compound | Definition, Examples, Structure, …

  3. Heterocyclic Chemistry - Michigan State University

  4. Heterocyclic Compound: Introduction, Classification and …

  5. Heterocyclic Compound - an overview | ScienceDirect Topics

  6. heterocyclic compound summary | Britannica

  7. Heterocyclic Compounds -Definition, Classification, Examples ...

  8. Heterocyclic compound - Aromatic, Aliphatic, Heteroatoms

  9. Chemistry of Heterocyclic Compounds | Chemistry of Heterocyclic ...

  10. 4.12: Heterocyclic Aromatic Compounds - Chemistry LibreTexts