(Z)-2-((2S,3R)-N-(tert-butoxycarbonyl)-2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-methylpentanamido)-3-methylpent-2-enoic acid

tert-butyl (R,Z)-(3-hydroxy-1-((1-hydroxy-3-methylpent-2-en-2-yl)amino)-3-methyl-1-oxobutan-2-yl)carbamate

allyl (R,Z)-2-(2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-methylbutanamido)-3-methylpent-2-enoate

(R,Z)-2-(2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-methylbutanamido)-3-methylpent-2-enoic acid

allyl (R,Z)-2-(N-(tert-butoxycarbonyl)-2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-methylbutanamido)-3-methylpent-2-enoate