(R)-1-(tert-butoxy)-4-methyl-1-oxopentan-2-yl 4-nitrobenzoate

(S)-tert-butyl 2-chloro-4-methylpentanoate

tert-butyl (2R)-2-acetyloxy-3-methylbutanoate

(2R)-2-acetyloxy-3-methylbutanoic acid

D-缬氨酸