9H-茚并[1,2-e][1,2,5]噁二唑o[3,4-b]吡嗪-9-酮

d,l-(1,3-Dioxoindan)-2-spiro-(6'-acetoxy-3',6'-dihydro-2'H-pyran)

(1',3'-dioxospiro[3,4-dihydropyran-2,2'-indene]-4-yl) acetate

2-(1,3-dioxoinden-2-yl)indene-1,3-dione

2-(4-methoxyphenyl)iminoindene-1,3-dione