上游原料
Ethyl 2-bromoacetate; Ethyl bromoacetate4,6-dimethyl-2-oxo-2H-chromen-7-yl acetate8-acetyl-7-hydroxy-4,6-dimethyl-2H-chromen-2-oneethyl 2-[(8-acetyl-4,6-dimethyl-2-oxo-2H-chromen-7-yl)oxy]acetate2-[(8-acetyl-4,6-dimethyl-2-oxo-2H-chromen-7-yl)oxy]acetic acid4,6,9-trimethyl-2-oxo-2H-furo[2,3-h]chromene-8-carboxylic acid
