(2R)-3-[(3S)-1-benzyl-6-benzyloxy-3-(tert-butyldimethylsilanyloxymethyl)-2,3-dihydro-1H-indol-4-yl]-2-benzyloxycarbonylamino-2-methyl-3-oxopropionic acid methyl ester

(4S)-2-benzyloxy-4-methoxycarbonyl-4-methyl-5-oxo-4,5-dihydrooxazole

2-benzyloxycarbonyloamino-2-methylmalonic acid dimethyl ester

(2R)-2-benzyloxycarbonylamino-2-methylmalonic acid monomethyl ester

(3S)-1-benzyl-6-benzyloxy-4-bromo-3-hydroxymethylindoline