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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
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  CHEBI ontology 19808
    chemical entity 19808
      molecular entity 19807
        polyatomic entity 19728
          molecule 19579
            cyclic compound 19383
              aromatic compound 19172
                organic aromatic compound 19172
                  arene 17070
                    monocyclic arene 5657
                      cyclopentadienide 0
Path 2
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  CHEBI ontology 19808
    subatomic particle 19807
      composite particle 19807
        hadron 19807
          baryon 19807
            nucleon 19807
              atomic nucleus 19807
                atom 19807
                  main group element atom 19704
                    main group molecular entity 19704
                      s-block molecular entity 19489
                        hydrogen molecular entity 19484
                          hydrides 18841
                            organic hydride 18350
                              organic fundamental parent 18350
                                hydrocarbon 18061
                                  olefin 5478
                                    cyclic olefin 108
                                      monocyclic olefin 105
                                        cycloalkadiene 11
                                          cyclopentadiene 0
                                            cyclopentadienide 0
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