Kermanshah Bistoon Chemical Complex (Meshbak) was registered in 1991 and was commissioned in 1994 with the construction of buildings and installation of production equipment on a land area of 17,800 square meters. In 2000, it succeeded in synthesizing and technically producing chloridazone as the second largest producer in the world. In 2002, it launched its second production unit with the technical production of proxyphenic aging toxin. Biston Chemical Complex became the second largest producer of this toxin in the world after the third company Tomo Japan. In 2002, by equipping the EC formulation unit, the complex was able to formulate various toxins in the form of EC. In 2007, the formulation line of herbicides for powder and granular pesticides was put into operation. . The company's research and development unit is certified by the Ministry of Industries and Mines and the quality control unit is licensed by the Plant Protection Organization, which uses high quality information and communication with scientific and research centers, high quality products. Supplies according to FAO standard. Biston Chemical Complex is the selected national unit in 2003 in the production of pesticides from the Ministry of Jihad Agriculture and the national sample research unit in 2005 from the Ministry of Industries and Mines.