(2R,4S,5S)-5-[(tert-butoxycarbonyl)amino]-4-[(tert-butyldimethylsilyl)oxy]-2,7-dimethyloctanoic acid

(5R,1'S)-5-[1'[(tert-butoxycarbonyl)amino]-3'-methylbutyl]-dihydrofuran-2(3H)-one

(5S,1'S)-5-<1'--3'-methylbutyl>dihydrofuran-2(3H)-one

(3R,5S,1'S)-5-<1'-<(N-tert-Butoxycarbonyl)amino>-3'-methylbutyl>-3-(2-methylpropyl)dihydrofuran-2(3H)-one

(3S,5S)-5-((1S)-1-(N-Boc-amino)-3-methylbutyl)-3-(2-methylprop-2-enyl)dihydrofuran-2(3H)-one