tert-butyl (2S,3S)-2-((tert-butoxycarbonyl)amino)-3-(methoxymethoxy)-4-oxobutanoate

tert-butyl (2S,3'S,2''S,3''R)-1-(3'-amino-(2''-methoxymethyloxy-3''-tert-butoxycarbonylamino-4''tertbutoxy-4''-oxobutyl)-4'-tert-butoxy-4'-oxobutyl)azetidine-2-carboxylate