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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:cysteic acid
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Accession:CHEBI:21260 term browser browse the term
Definition:An amino sulfonic acid that is the sulfonic acid analogue of cysteine.
Synonyms:exact_synonym: 2-amino-3-sulfopropanoic acid
 related_synonym: 3-Sulfoalanine;   Formula=C3H7NO5S;   InChI=1S/C3H7NO5S/c4-2(3(5)6)1-10(7,8)9/h2H,1,4H2,(H,5,6)(H,7,8,9);   InChIKey=XVOYSCVBGLVSOL-UHFFFAOYSA-N;   SMILES=NC(CS(O)(=O)=O)C(O)=O;   beta-Sulfoalanine;   cysteine sulfonic acid
 xref: CAS:13100-82-8;   ECMDB:ECMDB02757;   HMDB:HMDB0002757;   PMID:21876281;   PMID:25156684;   PMID:8283286;   Reaxys:1725494;   Wikipedia:Cysteic_acid

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19792
    chemical entity 19791
      group 19698
        inorganic group 19168
          sulfo group 5739
            organosulfonic acid 5739
              amino sulfonic acid 411
                cysteic acid 0
                  L-cysteic acid 0
                  threonyl-3-sulfoalanine 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19792
    subatomic particle 19788
      composite particle 19788
        hadron 19788
          baryon 19788
            nucleon 19788
              atomic nucleus 19788
                atom 19788
                  main group element atom 19675
                    p-block element atom 19675
                      carbon group element atom 19571
                        carbon atom 19560
                          organic molecular entity 19560
                            organic group 18508
                              organic divalent group 18501
                                organodiyl group 18501
                                  carbonyl group 18404
                                    carbonyl compound 18404
                                      carboxylic acid 18079
                                        monocarboxylic acid 17425
                                          fatty acid 15860
                                            saturated fatty acid 15826
                                              propionic acid 3668
                                                alanine 104
                                                  alanine derivative 102
                                                    cysteic acid 0
                                                      L-cysteic acid 0
                                                      threonyl-3-sulfoalanine 0
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