Substances can have multiple different names and formulae. To find all information about a substance, use the CAS Registry Number, a unique ID. However, remember that CAS RN's are not perfect--to be comprehensive, search by CAS RNs as well as substance names.
Look for a CAS Registry Number:
Includes online access to Chemical Abstracts and the CAS Registry File of over 19 million chemical substances.
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IUPAC Compendium of Chemical Terminology (aka the 'Gold Book")
These are online tools for searching for chemical properties.
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