2-(dimethylaminomethylidene)indene-1,3-dione

4-benzoyl-1,3-diphenylfluoren-9-one

2-benzhydrylideneindene-1,3-dione

3'-(4-chlorophenyl)spiro[indene-2,2'-oxirane]-1,3-dione

2-fluoren-9-ylideneindene-1,3-dione