Chemical properties are colorless crystals crystallized by water or ethanol. Slightly soluble in water, insoluble in benzene, toluene and petroleum ether, soluble in methanol, ethanol, acetone and glacial acetic acid. Use for the production of alkyd resin, unsaturated Chemicalbook and polyester resin and other polymers and plasticizers, also used in the manufacture of film color modifier, paint and polyester fiber dyeing modifier and medicine. Uses Used as chromatographic analysis reagent, also used in organic synthesis