This is a recording of the fourth class on Chemical Information Retrieval on Oct 15, 2009 at Drexel University. It starts with some tips on removing formatting from Wikispaces pages, the Drexel Cisco VPN client for accessing paid subscriptions off campus and how to link to a DOI. The first two assignments for the class are then described. The first involves summarizing each paragraph of an article and an option to use AcaWiki is demonstrated. The second involves filling in an FAQ for publishing in chemistry. FriendFeed is then presented as a resource to help answer questions followed by an extensive overview of available information on ChemSpider, covering SMILES, InChIs, InChIKeys, experimental and predicted properties, linked databases and contributed spectra. Finally a demonstration of Beilstein Crossfire is presented with an emphasis on doing substructure searching.
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