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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:64366 term browser browse the term
Definition:A pyridinium ion obtained by formal condensation of four molecules of lysine.
Synonyms:exact_synonym: 6-[2-(4-amino-4-carboxybutyl)-3,5-bis(3-amino-3-carboxypropyl)pyridinium-1-yl]norleucine
 related_synonym: 2-(4-amino-4-carboxybutyl)-1-(5-amino-5-carboxypentyl)-3,5-bis(3-amino-3-carboxypropyl)pyridinium;   2-amino-6-[3,5-bis(3-amino-4-hydroxy-4-oxobutyl)-2-(4-amino-5-hydroxy-5-oxopentyl)pyridin-1-ium-1-yl]hexanoic acid;   Formula=C24H40N5O8;   Ide;   InChI=1S/C24H39N5O8/c25-16(21(30)31)4-1-2-11-29-13-14(7-9-18(27)23(34)35)12-15(8-10-19(28)24(36)37)20(29)6-3-5-17(26)22(32)33/h12-13,16-19H,1-11,25-28H2,(H3-,30,31,32,33,34,35,36,37)/p+1;   InChIKey=RGXCTRIQQODGIZ-UHFFFAOYSA-O;   SMILES=NC(CCCC[n+]1cc(CCC(N)C(O)=O)cc(CCC(N)C(O)=O)c1CCCC(N)C(O)=O)C(O)=O
 xref: CAS:991-01-5;   HMDB:HMDB0000739;   PMID:19178285;   PMID:20361748;   PMID:20625235;   PMID:21153833;   PMID:21415130;   PMID:21621489;   PMID:21726534;   PMID:21757624;   PMID:21793711;   PMID:21887606;   PMID:21965222;   PMID:21999391;   PMID:22088351;   Reaxys:4074233;   Wikipedia:Isodesmosine

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  CHEBI ontology 24830
    role 24747
      application 23892
        indicator 9372
          biomarker 7106
            isodesmosine 0
Path 2
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  CHEBI ontology 24830
    subatomic particle 24789
      composite particle 24789
        hadron 24789
          baryon 24789
            nucleon 24789
              atomic nucleus 24789
                atom 24789
                  main group element atom 24656
                    p-block element atom 24656
                      carbon group element atom 24452
                        carbon atom 24416
                          organic molecular entity 24416
                            organic group 22862
                              organic divalent group 22841
                                organodiyl group 22841
                                  carbonyl group 22828
                                    carbonyl compound 22828
                                      carboxylic acid 21903
                                        monocarboxylic acid 20861
                                          fatty acid 18333
                                            saturated fatty acid 18313
                                              straight-chain saturated fatty acid 17283
                                                hexanoic acid 75
                                                  lysine 30
                                                    lysine derivative 1
                                                      isodesmosine 0
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