allyl O-(tert-butyldimethylsilyl)-N-(((3R,5R)-5-((tert-butyldimethylsilyl)oxy)-2-((S)-3-methyl-2-((((2,2,2-trichloroethoxy)carbonyl)-D-valyl)oxy)butanoyl)hexahydropyridazine-3-carbonyl)-L-leucyl)-D-threoninate