SciFinderSciFinder provides access to several Chemical Abstracts Service databases, including Chemical Abstracts, Registry, CASREACT, CHEMLIST, and CHEMCAT. Users may search more than 27 million citations to the chemistry literature by topic, author, CAS Registry Numbers, patent number, and CAS abstract number. More than 33 million chemical substances may be searched by chemical name, chemical structure, CAS Registry Numbers, and formula. Users can also do substructure searching.