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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 19770
    role 19720
      application 19411
        reagent 17227
          dioxygen 3525
            singlet dioxygen 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19770
    subatomic particle 19768
      composite particle 19768
        hadron 19768
          baryon 19768
            nucleon 19768
              atomic nucleus 19768
                atom 19768
                  main group element atom 19662
                    main group molecular entity 19662
                      p-block molecular entity 19662
                        chalcogen molecular entity 19391
                          oxygen molecular entity 19354
                            elemental oxygen 5767
                              diatomic oxygen 3555
                                dioxygen 3525
                                  singlet dioxygen 0
paths to the root