Synonyms: Phenoxy,4,4'-[(3,5-di-tert-butyl-4-oxo-2,5-cyclohexadien-1-ylidene)methylene]bis[2,6-di-tert-butyl-(7CI,8CI); Phenoxy,4-[[3,5-bis(1,1-dimethylethyl)-4-oxo-2,5-cyclohexadien-1-ylidene][3,5-bis(1,1-dimethylethyl)-4-oxyphenyl]methyl]-2,6-bis(1,1-dimethylethyl)-(9CI); Yang's biradical