4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-formyl-butyric acid ethyl ester

5-hydroxy-1-(2-hydroxy-1-(S)-phenyl-ethyl)-4-isobutyl-1,5-dihydro-pyrrol-2-one

3-异丁基戊二酸

3-异丁基戊二酸酐

2-(3-甲基丁亚基)丙二酸二乙酯