tert-butyl (S)-2-((3-((S)-2-amino-4-methylpentanamido)propyl)amino)-3-((2R,3R,4R,5R)-3,4-bis((tert-butyldimethylsilyl)oxy)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-2-yl)propanoate

tert-butyl (R)-2-((3-((S)-2-amino-4-methylpentanamido)propyl)amino)-3-((2R,3R,4R,5R)-3,4-bis((tert-butyldimethylsilyl)oxy)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-2-yl)propanoate