(R)-(+)-甲基丁二酸

(S)-4-(tert-butoxy)-2-methyl-4-oxobutanoic acid

tert-butyl (S)-3-methyl-4-oxo-4-((R)-3,3,5-trimethyl-2-oxopyrrolidin-1-yl)butanoate

衣康酸

乙酸酐