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

(1R,3S)-(1-benzyl-4-hydroxy-3-methylbutyl)carbamic acid tert-butyl ester

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

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

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