1,1,3,4-四甲基-2-茚酮

(1,1,4,4-tetramethyl-3-oxo-2H-naphthalen-2-yl) acetate

2-hydroxy-1,1,3,3-tetramethylindene-2-carboxylic acid

(1,1,4,4-tetramethyl-3-oxo-2H-naphthalen-2-yl) benzoate

2-[2-(2-carboxypropan-2-yl)phenyl]-2-methylpropanoic acid