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

3-benzhydryl-1H-indole

5-phenylbenzo[a]anthracene-7,12-dione

2a,8a-dichloro-1,1-diphenyl-1,2,2a,8a-tetrahydrocyclobuta[b]naphthalene-3,8-dione