ChemSpider is a chemical structure database that provides access to structures, properties, and associated information. It is owned by the Royal Society of Chemistry.
SciFinder N is the online version of Chemical Abstracts, and provides access to information on substances, reactions, and patent and journal references.
Provides physical & chemical characteristics, structure, MSDS, IR spectra and more. Search by CAS registry number, molecular formula, chemical name, physical & chemical properties.