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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:naphthionic acid
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Accession:CHEBI:38219 term browser browse the term
Definition:An aminonaphthalenesulfonic acid that has formula C10H9NO3S.
Synonyms:exact_synonym: 4-aminonaphthalene-1-sulfonic acid
 related_synonym: 1-naphthylamine-4-sulfonic acid;   4-Aminonaphthalin-1-sulfonsaeure;   4-amino-1-naphthalene sulfonic acid;   Formula=C10H9NO3S;   InChI=1S/C10H9NO3S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6H,11H2,(H,12,13,14);   InChIKey=NRZRRZAVMCAKEP-UHFFFAOYSA-N;   Naphthionsaeure;   Piria's acid;   Piria-Saeure;   SMILES=Nc1ccc(c2ccccc12)S(O)(=O)=O;   alpha-naphthylamine-4-sulfonic acid;   alpha-naphthylamine-p-sulfonic acid
 xref: Beilstein:1971299;   CAS:84-86-6;   Gmelin:241888

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 880
    chemical entity 880
      group 843
        inorganic group 698
          sulfo group 3
            organosulfonic acid 3
              amino sulfonic acid 2
                aminonaphthalenesulfonic acid 0
                  naphthionic acid 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 880
    subatomic particle 865
      composite particle 865
        hadron 865
          baryon 865
            nucleon 865
              atomic nucleus 865
                atom 865
                  main group element atom 855
                    p-block element atom 852
                      chalcogen 813
                        oxygen atom 760
                          oxygen molecular entity 760
                            hydroxides 684
                              oxoacid 312
                                chalcogen oxoacid 54
                                  sulfur oxoacid 45
                                    sulfonic acid 14
                                      sulfo group 3
                                        organosulfonic acid 3
                                          arenesulfonic acid 1
                                            naphthalenesulfonic acid 0
                                              aminonaphthalenesulfonic acid 0
                                                naphthionic acid 0
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