He also became the first to prepare metallic aluminum, but his greatest work came from a compound synthesized from ammonium cyanate.  
At Heidelberg he studied under Leopold Gmelin, who recognized this man's ability and advised him to make chemistry his career.  He then went to study under Jons Jakob Berzelius and would later translate Berzelius' work into German.  Along with Justus Liebig he took up the study of benzaldehyde, and from this work came the theory of radicals, the first attempt to understand the structure of organic compounds.  He also became the first to prepare metallic aluminum, but his greatest work came from a compound synthesized from ammonium cyanate.  FTP, name this scientist who, in 1828, synthesized urea.
At Heidelberg he studied under Leopold Gmelin, who recognized this man's ability and advised him to make chemistry his career.  
Friedrich Wohler