3,3'-Dimethyl-5,5'-di-tert-butyl-4,4'-diphenoquinone , its cas register number is 2417-00-7. It also can be called (4E)-2-methyl-4-(3-methyl-4-oxo-5-tert-butyl-1-cyclohexa-2,5-dienylidene)-6-tert-butyl-cyclohexa-2,5-dien-1-one .