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\subsection{Provided Libraries}  Large libraries corresponding to compound catalogs from a variety of sources are provided and periodically updated to ensure continued relevance, especially as with regards to compound availability from commercial sources. Currently, Pharmit has pre-built libraries generated from CHEMBL2.0 \cite{Gaulton_2011}, ChemDiv (\hyperref[http://www.chemdiv.com/]{www.chemdiv.com}), (\url{www.chemdiv.com}),  MolPort, NCI Open Chemical Repository, and PubChem,     Although a search is limited to the compounds of the selected library, all compounds within the provided libraries are cross-annotated so, for example, it is possible to look up the PubChem record of a compound found by searching the MolPort library.