This excerpt taken from the SYT 20-F filed Mar 1, 2006.
and GESAPRIM® act mainly against annual grasses and broad-leaved weeds. Although the active substance, atrazine, was introduced in 1957, and has been off patent for a number of years, it remains an important product for broad-leaved weed control in corn. It is currently going through a reregistration process in major markets and has received favorable evaluation in the United States by the EPAs Scientific Advisory Panel. In the European Union atrazine was not granted re-registration. In European markets Syngenta will extend the use of terbuthylazine which has already been safely used in Germany and Italy for several years.