1. Natural Products as Sources of New Drugs over the Period 1981−2002
2. We used data published by a monthly magazine calledDrug Topicshttp://drugtopics.modernmedicine.com/(accessed Sep 2010) . The same list can also be found onhttp://www.drugs.com(accessed Sep 2010) .
3. NjardarsonWeb site.http:/cbc.arizona.edu/njardarson/group(accessed Sep 2010) .
4. Njardarson, J. T.The Development of New Synthetic Methods.Abstracts of Papers, 238th ACS National Meeting, Washington, DC, United States, August 16−20, 2009; ORGN-220.
5. Kleemann, A.; Engel, J.;Pharmaceutical Substances: Synthesis, Patents, and Application,4th ed.Thieme:Germany, 2001; p2488.