Reaxys is a chemistry database that provides information about millions of chemical structures, reactions, and properties. It also lists journal articles, patents, and other publications related to them. Reaxys includes substance property and reaction data, synthesis options, experimental procedures, patent information, and citations. Its comprehensive and expert-curated chemistry, medicinal chemistry, and pharmacology data is derived from patents, journals, and books. Reaxys is a great resource for researchers who are investigating organic synthesis or searching for data on physical, chemical, spectral, bioactivity, or toxicological properties of chemical compounds.