| Name | Metaprefix | URI |
|---|---|---|
| ChemIDplus | chemidplus |
https://chem.nlm.nih.gov/chemidplus/rn/57-27-2 |
| Bioregistry | bioregistry |
https://bioregistry.io/chemidplus:57-27-2 |
| Identifiers.org | miriam |
https://identifiers.org/chemidplus:57-27-2 |
| Name-to-Thing | n2t |
https://n2t.net/chemidplus:57-27-2 |