2-(1,1-dimethyl-9-oxo-1,2,9,9a-tetrahydro-fluoren-3-ylidene)-indan-1,3-dione

2,2-dimethoxy-1,3-indanedione

2-苯甲酰-1,3-茚满二酮

2-(1-oxo-1H-inden-3-yl)-2H-indene-1,3-dione

2-(1-naphthylidene)-1,3-indandione