- - Jacobsen Thioureas: New Versatile Organocatalysts http://www.sigmaaldrich.com/Area_of_Interest/Chemistry/Chemical_Synthesis/Product_Highlights/Jacobsen.html Sigma-Aldrich - Sigma-Aldrich, a global leader in life science and high technology. http://www.sigmaaldrich.com/Area_of_Interest/Chemistry/Chemical_Synthesis/Product_Highlights.html http://www.sigmaaldrich.com/img/assets/21220/logo_aldrich.gif Mon, 14 Apr 2008 09:32:48 -0600 Mon, 14 Apr 2008 09:32:48 -0600