1. ChemSpider Home Page.http://www.chemspider.com/(accessed Aug 2010) .
2. Project Prospect Home Page.http://www.rsc.org/Publishing/Journals/ProjectProspect/index.asp(accessed Aug 2010) .
3. Wkipedia Home Page.http://www.wikipedia.org/(accessed Aug 2010) .
4. PubChem Home Page.http://pubchem.ncbi.nlm.nih.gov/(accessed Aug 2010) .
5. ChEBI Home Page.http://www.ebi.ac.uk/chebi/(accessed Aug 2010) .