Chemistry online Resources
Link - http://www.cas.org/index.html
"CAS is a team of scientists, creating and delivering the most complete and effective digital information environment for scientific research and discovery. CAS provides pathways to published research in the world's journal and patent literature - virtually everything relevant to chemistry plus a wealth of information in the life sciences and a wide range of other scientific disciplines - back to the beginning of the late 19th century.
CAS, a division of the American Chemical Society, provides the world's largest and most current collection of chemical and related scientific information, including the most authoritative collection of disclosed chemical substance information, the CAS RegistrySM. CAS combines these databases with advanced search and analysis technologies to deliver the most complete, crosslinked, and effective digital information environment for scientific research and discovery, including such products as SciFinder, STN, STN Express, and STN AnaVistTM, among others"[1].
1. http://www.cas.org/aboutcas/index.html
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