Octocrylene, also called octocrilene, which is an organic substance with a chemical formula of C24H27NO2, an oil-soluble UV absorber, insoluble in water. It has the property of helping other oil-soluble solid sunscreens to dissolve. Also has the advantages of high absorption rate, non-toxicity, no teratogenic effect, good light and thermal stability, etc. It can absorb UV-B and a small amount of UV-A. It is a class I sunscreen approved by the US FDA and is widely used in the United States and Europe.