5,5'-dimethoxy-2-(4-methoxyphenyl)-1,2'-spirobi[indene]-1',3'-dione

5-methoxy-2-(4-methoxyphenyl)-5'-(2-(piperidin-1-yl)ethoxy)-1,2'-spirobi[indene]-1',3'-dione

methyl 5-methoxyl-2-formylbenzoate

2-(2,2-Dibromo-vinyl)-5-methoxy-benzoic acid methyl ester