Fmoc-(4S,5S)-4-hydroxy-pyrrolidin-2-one

(4S,5S)-ethyl (4-isobutyl-2-oxo-oxazolidin-5-yl)acetate

9-芴甲基-N-琥珀酰亚胺基碳酸酯

(3R,4S)-(t-butyloxycarbonyl)-4-amino-3-hydroxy-6-methylheptanoic acid ethyl ester

(S)-(9H-fluoren-9-yl)methyl 4-isobutyl-2,5-dioxooxazolidine-3-carboxylate