173469-72-2 2,3-Dimethyl-alpha-ethyl-4-oxo-4H-1-benzopyran-6-acetic acid 2-(2,3-Dimethylchromon-6-yl)butanoic acid 4H-1-Benzopyran-6-acetic acid, 2,3-dimethyl-alpha-ethyl-4-oxo-