5-hydroxy-4,7-dimethyl-2-oxo-2H-chromene-6-carboxylic acid

2,4-二羟基-6-甲基苯甲酸甲酯

5-hydroxy-4,7-dimethyl-2-oxo-2H-chromene-6-carboxylic acid methyl ester

2,4-二羟基-6-甲基甲酸乙酯

磷酸