| Name | Metaprefix | URI |
|---|---|---|
| Chemical Component Dictionary | pdb-ccd |
https://www.ebi.ac.uk/pdbe-srv/pdbechem/chemicalCompound/show/PI |
| Bioregistry | bioregistry |
https://bioregistry.io/pdb-ccd:PI |
| Identifiers.org | miriam |
https://identifiers.org/pdb-ccd:PI |
| Name-to-Thing | n2t |
https://n2t.net/pdb-ccd:PI |