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The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at The data is made available under the Creative Commons License (CC BY 3.0, For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.

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Accession:CHEBI:146233 term browser browse the term
Definition:An allotrope of carbon with molecular formula C18 existing as a ring of eighteen carbon atoms, connected by alternating triple and single bonds.
Synonyms:exact_synonym: cyclooctadeca-1,3,5,7,9,11,13,15,17-nonayne
 related_synonym: Formula=C18;   InChI=1S/C18/c1-2-4-6-8-10-12-14-16-18-17-15-13-11-9-7-5-3-1;   InChIKey=GPWDPLKISXZVIE-UHFFFAOYSA-N;   SMILES=C1#CC#CC#CC#CC#CC#CC#CC#CC#C1;   carbon-18
 xref: PMID:17838807;   PMID:29315836;   PMID:31416933;   PMID:31431741;   PMID:31609631;   PMID:31670421;   PMID:31825030;   PMID:31942913;   PMID:31971391;   PMID:31990284;   PMID:32022006;   PMID:32091224;   Wikipedia:Cyclo(18)carbon

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19853
    chemical entity 19853
      molecular entity 19851
        elemental molecular entity 16328
          elemental carbon 8787
            cyclo[18]carbon 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19853
    subatomic particle 19851
      composite particle 19851
        hadron 19851
          baryon 19851
            nucleon 19851
              atomic nucleus 19851
                atom 19851
                  main group element atom 19744
                    p-block element atom 19744
                      carbon group element atom 19650
                        carbon atom 19639
                          organic molecular entity 19639
                            organic molecule 19568
                              organic cyclic compound 19378
                                carbocyclic compound 18284
                                  cyclo[18]carbon 0
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