1. Initative for Chemical Genetics. ChemBank.http://chembank.broad.harvard.edu/(accessed January 17, 2012).
2. Chemical Components in PDB. PDBe.http://www.ebi.ac.uk/msd-srv/msdchem/cgi-bin/cgi.pl(accessed January 17, 2012).
3. http://www.genome.jp/keeg/ligand.html(accessed January 17, 2012).
4. TimTec Home Page.http://www.timtec.net/(accessed January 17, 2012).
5. PubChem Structure Search. PubChem.http://pubchem.ncbi.nlm.nih.gov/search/(accessed January 17, 2012).