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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.

Term:singlet dioxygen
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Accession:CHEBI:26689 term browser browse the term
Definition:A reactive oxygen species that is the lowest excited state of the dioxygen molecule.
Synonyms:exact_synonym: singlet molecular oxygen
 related_synonym: (1)O2;   Formula=O2;   InChI=1S/O2/c1-2;   InChIKey=MYMOFIZGZYHOMD-UHFFFAOYSA-N;   SMILES=O=O
 xref: Drug_Central:4235;   Gmelin:491;   PMID:18264592;   PMID:21735018;   PMID:21883246;   Reaxys:16514885;   Reaxys:3587218;   Wikipedia:Singlet_oxygen

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 20072
    role 20024
      application 19760
        reagent 17712
          dioxygen 3977
            singlet dioxygen 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 20072
    subatomic particle 20071
      composite particle 20071
        hadron 20071
          baryon 20071
            nucleon 20071
              atomic nucleus 20071
                atom 20071
                  main group element atom 19971
                    main group molecular entity 19971
                      p-block molecular entity 19971
                        chalcogen molecular entity 19713
                          oxygen molecular entity 19681
                            elemental oxygen 6156
                              diatomic oxygen 4004
                                dioxygen 3977
                                  singlet dioxygen 0
paths to the root