2-[(1R,3R)-3-Benzyloxycarbonylamino-1-(tert-butyl-diphenyl-silanyloxy)-4-methyl-pentyl]-thiazole-4-carboxylic acid

(2R,4R)-4-benzyloxycarbonylamino-2-(tert-butyldiphenylsilanyloxy)-5-methylhexanoic acid methyl ester

(1'R,3'R)-2-[3'-benzyloxycarbonylamino-1'-(tert-butyldiphenylsilanyloxy)-4'-methylpentyl]thiazole-4-carboxylic acid ethyl ester

(2R,4R)-4-benzyloxycarbonylamino-2-hydroxy-5-methylhexanoic acid methyl ester

(1R,2'R)-{2-[2'-(tert-butyldiphenylsilanyloxy)-2'-carbamoylethyl]-2-methylpropyl}carbamic acid benzyl ester

(1R,2'R)-{2-[2'-(tert-butyldiphenylsilanyloxy)-2'-thiocarbamoylethyl]-2-methylpropyl}carbamic acid benzyl ester

(4S)-4-benzyloxycarbonylamino-5-methylhex-2-enoic acid methyl ester

(4R)-4-benzyloxycarbonylamino-5-methylhexanoic acid methyl ester