NMR Study of β - ( 3 - Methyl - 2 , 4 - Dioxocyclohexyl ) Propionic Acid and Its Derivatives
β（3-甲基-2,4-二氧代环己基）丙酸及其衍生物的NMR研究
propionic acid derivativespropionic acid derivativespropionic acid derivatives