Registry File
The Registry File contains
factual information about 12 million substances identified since 1956. Typical
information includes:
- CAS
Registry Number
- Molecular formula
- Ring data
- CA
Index Name
- Name changes throughout
indexing periods
- All synonyms and trivial
names
- Number of references
in the CA file
This file may be searched
by:
- complete chemical name
- 1-2 words
- 3 or more words
- chemical fragment
- molecular formula
- CAS Registry Number
Hint: Remember that
molecular formulas are NOT unique. Seaching by molecular formula in this
file will yield many results. Use this file to find a CAS
Registry Number from your substance's chemical name if you do not already
have one.