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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:142640 term browser browse the term
Definition:A member of the class of nectriapyrones that is pyran-2-one which is substituted at positions 3, 4, and 6 by methyl, hydroxy, and but-2-en-2-yl groups, respectively in which the butenyl substituent has E configuration.
Synonyms:exact_synonym: 6-[(2E)-but-2-en-2-yl]-4-hydroxy-3-methyl-2H-pyran-2-one
 related_synonym: Formula=C10H12O3;   InChI=1S/C10H12O3/c1-4-6(2)9-5-8(11)7(3)10(12)13-9/h4-5,11H,1-3H3/b6-4+;   InChIKey=OBAWNXJOHPSFMJ-GQCTYLIASA-N;   SMILES=C=1(C=C(OC(C1C)=O)/C(/C)=C/C)O;   demethylnectriapyrone
 xref: PMID:30443971

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Term Annotations click to browse term
  CHEBI ontology 909
    chemical entity 909
      molecular entity 907
        polyatomic entity 876
          heteroatomic molecular entity 832
            hydroxides 695
              organic hydroxy compound 601
                desmethylnectriapyrone 0
                  nectriapyrone + 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 909
    subatomic particle 894
      composite particle 894
        hadron 894
          baryon 894
            nucleon 894
              atomic nucleus 894
                atom 894
                  main group element atom 863
                    p-block element atom 860
                      carbon group element atom 836
                        carbon atom 835
                          organic molecular entity 835
                            organic group 403
                              organic divalent group 401
                                organodiyl group 401
                                  carbonyl group 400
                                    carbonyl compound 400
                                      carboxylic ester 254
                                        lactone 167
                                          delta-lactone 70
                                            2-pyranones 6
                                              nectriapyrones 0
                                                desmethylnectriapyrone 0
                                                  nectriapyrone + 0
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