二苯甲酮

3',3'-diphenylspiro[2,5-cyclohexadiene-1,1'-[2]oxacyclobutan]-4-one

3,3-diphenyl-1,2,5-trioxaspiro[5.5]undeca-7,10-dien-9-one

2-[4-(dimethylamino)phenyl]cyclohexa-2,5-diene-1,4-dione

2,5-bis(2,4-dimethylphenyl)benzene-1,4-diol