| 英文同义词: | 2-Methyl-4-methoxy-6-oxo-6H-pyran-3-carboxylic acid methyl ester;2-Oxo-4-methoxy-6-methyl-2H-pyran-5-carboxylic acid methyl ester;4-Methoxy-6-methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester;2H-Pyran-5-carboxylic acid, 4-methoxy-6-methyl-2-oxo-, methyl ester |