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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:butynedioic acid
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Accession:CHEBI:30781 term browser browse the term
Definition:An acetylenic compound that is acetylene in which the hydrogens are replaced by carboxy groups.
Synonyms:related_synonym: 2-Butynedioic acid;   Formula=C4H2O4;   InChI=1S/C4H2O4/c5-3(6)1-2-4(7)8/h(H,5,6)(H,7,8);   InChIKey=YTIVTFGABIZHHX-UHFFFAOYSA-N;   SMILES=OC(=O)C#CC(O)=O;   acetylenedicarboxylic acid;   but-2-ynedioic acid
 alt_id: CHEBI:19488;   CHEBI:22969;   CHEBI:2420
 xref: Beilstein:878357;   CAS:142-45-0;   Gmelin:26624;   KEGG:C03248;   PMID:10843633;   PMID:12978816;   Reaxys:878357;   Wikipedia:Acetylenedicarboxylic_acid
 cyclic_relationship: is_conjugate_acid_of CHEBI:30782

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19801
    chemical entity 19800
      molecular entity 19796
        polyatomic entity 19706
          molecule 19527
            organic molecule 19494
              acetylenic compound 5795
                butynedioic acid 0
                  cellocidin 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19801
    subatomic particle 19797
      composite particle 19797
        hadron 19797
          baryon 19797
            nucleon 19797
              atomic nucleus 19797
                atom 19797
                  main group element atom 19684
                    p-block element atom 19684
                      carbon group element atom 19583
                        carbon atom 19572
                          organic molecular entity 19572
                            organic group 18520
                              organic divalent group 18513
                                organodiyl group 18513
                                  carbonyl group 18415
                                    carbonyl compound 18415
                                      dicarboxylic acids and O-substituted derivatives 10276
                                        dicarboxylic acid 10269
                                          C4-dicarboxylic acid 808
                                            butynedioic acid 0
                                              cellocidin 0
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