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Definitions of simple:
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furan benzofuran pyrrole indole isoindole thiophene benzothiophene imidazole benzimidazole purine pyrazole indazole oxazole benzoxazole isoxazole benzisoxazole thiazole benzothiazole benzene naphthalene anthracene pyridine quinoline isoquinoline pyrazine quinoxaline acridine pyrimidine quinazoline pyridazine cinnoline aromaticity organic-compound conjugated-system delocalized-electron pi-bond molecule substitution-chemistry heterocyclic carbon oxygen nitrogen sulfur basic-aromatic-ring protonation ion salt-chemistry pyridinium lone-pair electron amine antiaromaticity polycyclic-aromatic-hydrocarbon aryl |