(2R,4S,5S)-5-tert-Butoxycarbonylamino-4-(tert-butyl-dimethyl-silanyloxy)-6-methyl-2-(3-methyl-but-2-enyl)-heptanoic acid

4S-amino-5-(2-oxopyrrolidin-3S-yl)pent-2-enoic acid ethyl ester

D-Glutamic acid, N-[(1,1-dimethylethoxy)carbonyl]-, dimethyl ester