Protopedia
Collaborative 3D-encyclopedia of proteins & other molecules
URL: http://www.proteopedia.org/wiki/index.php/Main_Page
Chemistry Central
URL: http://www.chemistrycentral.com/
PubChem (NCBI)
URL: http://pubchem.ncbi.nlm.nih.gov/
eMolecules
URL: http://www.emolecules.com/
Chemspider
URL: http://www.chemspider.com/
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