Cyanazine, a triazine, has been a foundation herbicide for corn production in the United States since its introduction in 1971 by Shell. Cyanazine provides cost effective, broadspectrum control of 15 grasses and 41 broadleaf weeds as well as rotational flexibility, application flexibility, and resistance management. E.I. du Pont de Nemours and Company (DuPont) acquired cyanazine from Shell in 1987 and was the sole manufacturer until Griffin Corporation's entry into the cyanazine market. Griffin Corporation, a basic manufacturer and marketer of post-patent agricultural chemicals, acquired a facility for cyanazine synthesis in 1994.