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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:platinum-iridium alloy
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Accession:CHEBI:142649 term browser browse the term
Definition:Any alloy composed of platinum and iridium.
Synonyms:related_synonym: Formula=Ir.Pt;   InChI=1S/Ir.Pt;   InChIKey=HWLDNSXPUQTBOD-UHFFFAOYSA-N;   Ir/Pt alloy;   SMILES=[Ir].[Pt];   platinum-iridium alloys
 xref: Wikipedia:Platinum-iridium_alloy

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 20069
    chemical entity 20068
      chemical substance 13317
        mixture 12467
          alloy 0
            platinum-iridium alloy 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 20069
    subatomic particle 20068
      composite particle 20068
        hadron 20068
          baryon 20068
            nucleon 20068
              atomic nucleus 20068
                atom 20068
                  metal atom 17571
                    transition element atom 16942
                      d-block element atom 16933
                        nickel group element atom 10256
                          platinum 8532
                            platinum-iridium alloy 0
paths to the root