tert-butyl ((6E,12Z)-6-(butan-2-ylidene)-2,2,13-trimethyl-8,11-dioxo-3,3-diphenyl-4-oxa-7,10-diaza-3-silapentadec-12-en-12-yl)((2S,3R)-2-((tert-butoxycarbonyl)amino)-3-hydroxy-3-methylpentanoyl)carbamate

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

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

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

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