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

(2R,8S)-4-benzyloxy-8-(tert-butyldimethylsilanyloxymethyl)-2-methyl-1-oxo-1,2,3,6,7,8-hexahydro-3,6-diaza-as-indacene-2,3,6-tricarboxylic acid 3-benzyl ester 2-methyl ester 6-(2,2,2-trichloroethyl) ester

(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