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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:crotonic acid
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Accession:CHEBI:41131 term browser browse the term
Definition:A but-2-enoic acid with a trans- double bond at C-2. It has been isolated from Daucus carota.
Synonyms:exact_synonym: (2E)-but-2-enoic acid
 related_synonym: (2E)-2-butenoic acid;   (E)-2-Butenoic acid;   (E)-Crotonic acid;   (E)-but-2-enoic acid;   2-butenoic acid;   3-methylacrylic acid;   BEO;   Formula=C4H6O2;   InChI=1S/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2+;   InChIKey=LDHQCZJRKDOVOX-NSCUHMNNSA-N;   SMILES=[H]\\C(C)=C/C(O)=O;   alpha-butenoic acid;   alpha-crotonic acid;   beta-methacrylic acid;   beta-methylacrylic acid;   trans-2-Butenoic acid;   trans-Crotonic Acid
 alt_id: CHEBI:36250;   CHEBI:41125
 xref: Beilstein:1719943;   CAS:107-93-7;   CAS:3724-65-0;   HMDB:HMDB0010720;   KEGG:C01771;   LIPID_MAPS_instance:LMFA01030195;   MetaCyc:CROTONATE;   PDBeChem:BEO;   PMID:12867486;   PMID:15960983;   PMID:24390198;   Reaxys:1719943;   Wikipedia:Crotonic_acid
 cyclic_relationship: is_conjugate_acid_of CHEBI:35899

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19773
    role 19723
      biological role 19723
        biochemical role 19311
          metabolite 19293
            eukaryotic metabolite 18964
              plant metabolite 17446
                crotonic acid 0
                  (R)-crotonylcarnitine 0
                  crotonoyl-CoA 0
                  tiglic acid + 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19773
    subatomic particle 19771
      composite particle 19771
        hadron 19771
          baryon 19771
            nucleon 19771
              atomic nucleus 19771
                atom 19771
                  main group element atom 19665
                    p-block element atom 19665
                      carbon group element atom 19583
                        carbon atom 19573
                          organic molecular entity 19573
                            organic group 18603
                              organic divalent group 18594
                                organodiyl group 18594
                                  carbonyl group 18507
                                    carbonyl compound 18507
                                      carboxylic acid 18159
                                        monocarboxylic acid 17527
                                          fatty acid 16006
                                            unsaturated fatty acid 947
                                              monounsaturated fatty acid 447
                                                butenoic acid 31
                                                  2-butenoic acid 31
                                                    crotonic acid 0
                                                      (R)-crotonylcarnitine 0
                                                      crotonoyl-CoA 0
                                                      tiglic acid + 0
paths to the root