4-羟基-3-丙酰基-2H-色烯-2-酮

methyl 2-ethyl-4-oxo-4H-1-benzopyran-3-carboxylate

4-oxo-2-(3,4,5-trimethoxyphenyl)chromene-3-carboxylic acid

2-(3,4-dimethoxyphenyl)-4-oxochromene-3-carboxylic acid

2-(4-nitrophenyl)chromen-4-one