To use: Can be used as cationic dyes, color film developer intermediate. The product can also be used as active yellow X-R, cationic violet 2RL intermediate. Used as polyester resin solvent, polyurethane foam additive, metal preservative, etc., also used as azo dye raw material. As an analytical reagent, it can be used for the determination of osmium, palladium, platinum, ruthenium and nitrite.