SciFinder is the most comprehensive database for coverage of chemistry and chemical engineering. It has the world's largest collection of organic and inorganic substance information. It provides integrated access to CAPlus, CAS registry, CASREACT, CHEMLIST, and CHEMCATS, which are produced by Chemical Abstracts Service; and to MEDLINE, which is produced by the U.S. National Library of Medicine. Sources covered include over 10,000 journals, patents from over 60 patent authorities, book chapters, conference proceedings, dissertations, evaluated reference works, technical reports, as well as book reviews and biographical information. 15 million PatentPak PDFs are included, as well as 5 million synthetic protocols. SciFinder provides researchers with improved searching functionality and additional tools to analyze and manipulate retrieved data sets. Registration is required to use this database.