It is mainly used to produce raw materials for unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low-toxic pesticide 4049, and long-acting iodoamine. It is also paint, maleic rosin Chemicalbook, polymaleic anhydride, maleic anhydride-styrene copolymer. It is also an organic chemical raw material for the production of ink additives, paper additives, plasticizers and tartaric acid, fumaric acid, tetrahydrofuran, etc.