(2S)-N-(2,3,4,6-tetra-O-pivaloyl-β-D-galactopyranosyl)-2-n-propyl-5,6-didehydro-piperidin-4-one

tert-butyl 7-hydroxyhept-2-enoate

(S)-ethyl 2-benzamidopentanoate

L-正缬氨酸

(S)-3-benzyl-4-propyl-1,2,3-oxathiazolidine 2,2-dioxide