2,6-ditert-butyl-4-[(3,5-ditert-butyl-4-hydroxyphenyl)methylidene]cyclohexa-2,5-dien-1-one

2,6-ditert-butyl-4-prop-2-enoxyphenol

2-[(3,5-ditert-butyl-4-hydroxyphenyl)methylidene]indene-1,3-dione

2,6-ditert-butyl-4-(5,5-dimethyl-1,3-dioxan-2-yl)phenol