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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 19800
    role 19751
      application 19498
        indicator 8691
          biomarker 6473
            isodesmosine 0
Path 2
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  CHEBI ontology 19800
    subatomic particle 19799
      composite particle 19799
        hadron 19799
          baryon 19799
            nucleon 19799
              atomic nucleus 19799
                atom 19799
                  main group element atom 19698
                    p-block element atom 19698
                      carbon group element atom 19619
                        carbon atom 19609
                          organic molecular entity 19609
                            organic group 18718
                              organic divalent group 18702
                                organodiyl group 18702
                                  carbonyl group 18651
                                    carbonyl compound 18651
                                      carboxylic acid 18346
                                        monocarboxylic acid 17622
                                          fatty acid 16011
                                            saturated fatty acid 15986
                                              straight-chain saturated fatty acid 15440
                                                hexanoic acid 73
                                                  lysine 28
                                                    lysine derivative 1
                                                      isodesmosine 0
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