3,9-Bis[3,5-di-tert-butyl-4-hydroxyphenyl]-2,4,8,10-tetraoxaspiro[5.5]undecane

4,4'-(2,4,8,10-tetraoxaspiro[5.5]undecane-3,9-diyl)bis[2,6-di-tert-butylphenol]