Main use: folic acid, one of the components of the substance necessary for the growth and division of the body cells, can be used as a chemical reagent, organic synthesis raw materials, azo dyes intermediate, for the production of reactive red M-80, M-10B, reactive red purple X-2R dyes and cyanobenzoic acid, drug p-carboxybenzylamine. It can be used as a sunscreen, and the derivative octyl p-dimethylcarbamate is an excellent sunscreen.