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(S)-tert-Butyl 1-((2S,3S)-4-(tert-Butoxy)-3-(((S)-4-(tert-butoxy)-3-((tert-butyldimethylsilyl)oxy)-4-oxobutyl)amino)-2-((tert-butyldimethylsilyl)oxy)-4-oxobutyl)azetidine-2-carboxylate | Gentaur