2,4,10,12-tetra-t-butyl-7-methyl-14,15-dioxadispiro[5,1,5,2]-pentadeca-1,4,9,12-tetraene-3,11-dione

4,4'-<1,4-bis(3,5-di-t-butyl-4-hydroxyphenyl)but-2-enediylidene>bis(2,6-di-t-butyl-2,5-cyclohexadien-1-one)