SciFinder
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SciFinder is the most comprehensive source for chemical literature, searchable by topic, author, substances by name or CAS Registry Number, OR use the editor to draw chemical structures, substructures, or reactions. It is a core research tool for chemistry, biochemistry, chemical engineering, materials science, nanotechnology, physics, environmental science and other science and engineering disciplines. It also includes ChemZent,, an online version of Chemisches Zentralblatt (1830-1969).