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heterocyclic organic compound formed by a 5-membered ring and containing oxygen as its unique heteroatom, aromaatne heterotsükliline ühend valemiga C4H4O
C4H4O . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/C4H4O/1/eng (19.06.2026)