CAS Registry Number 3846-71-7 Name 2-(2'-Hydroxy-3',5'-di-tert-butylphenyl)benzotriazole Synonyms 2-(2H-benzotriazol-2-yl)-4,6-di-tert-butylphenol; 2-(3,5-Di-tert-butyl-2-hydroxyphenyl)-2H-benzotriazole; UV-320 Molecular Structure Molecular Formula C20H25N3O Molecular Weight 323.44