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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 21747
    role 21725
      application 21234
        indicator 8766
          biomarker 6547
            isodesmosine 0
Path 2
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  CHEBI ontology 21747
    subatomic particle 21732
      composite particle 21732
        hadron 21732
          baryon 21732
            nucleon 21732
              atomic nucleus 21732
                atom 21732
                  main group element atom 21649
                    p-block element atom 21649
                      carbon group element atom 21461
                        carbon atom 21363
                          organic molecular entity 21363
                            organic group 19925
                              organic divalent group 19912
                                organodiyl group 19912
                                  carbonyl group 19897
                                    carbonyl compound 19897
                                      carboxylic acid 19228
                                        monocarboxylic acid 18538
                                          fatty acid 16592
                                            saturated fatty acid 16569
                                              straight-chain saturated fatty acid 15912
                                                hexanoic acid 75
                                                  lysine 30
                                                    lysine derivative 1
                                                      isodesmosine 0
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