Chemical identifiers are sequences of letters or numbers that are unique to specific compounds. The following are common chemical identifiers:
- CAS RN* (Chemical Abstract Service Registry Number -- Also known as CAS-RN, or Registry Number)
*Most common
- International Chemical Identifier (InChID) - Pronounced "en-chee." More information about it here.
- Unique Ingredient Identifier (UNII)
To locate an identifier:
- Conduct a search for the compound in the ChemIDplus Database
- Record the identifier number
- Use the identifier in other databases to help narrow your search
