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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:36767 term browser browse the term
Definition:A monocyclic arene that has formula C5H5.
Synonyms:exact_synonym: cyclopenta-2,4-dienide
 related_synonym: C5H5;   Cp(-);   Formula=C5H5;   InChI=1S/C5H5/c1-2-4-5-3-1/h1-5H/q-1;   InChIKey=SINKOGOPEQSHQD-UHFFFAOYSA-N;   SMILES=c1cc[cH-]c1;   cyclopentadienide anion
 xref: Beilstein:3587332;   CAS:12127-83-2;   Gmelin:81759

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19786
    chemical entity 19786
      molecular entity 19784
        polyatomic entity 19704
          molecule 19549
            cyclic compound 19385
              aromatic compound 19168
                organic aromatic compound 19168
                  arene 17088
                    monocyclic arene 5655
                      cyclopentadienide 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19786
    subatomic particle 19784
      composite particle 19784
        hadron 19784
          baryon 19784
            nucleon 19784
              atomic nucleus 19784
                atom 19784
                  main group element atom 19675
                    main group molecular entity 19675
                      s-block molecular entity 19443
                        hydrogen molecular entity 19439
                          hydrides 18763
                            organic hydride 18363
                              organic fundamental parent 18363
                                hydrocarbon 18078
                                  olefin 5473
                                    cyclic olefin 107
                                      monocyclic olefin 104
                                        cycloalkadiene 11
                                          cyclopentadiene 0
                                            cyclopentadienide 0
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