[(1S,3S)-3-hydroxymethyl-1-((2S,4S)-4-isopropyl-5-oxo-furanidin-2-yl)-4-methylpentyl]carbamic acid tert-butyl ester

(2S,2'S,2"S,4"S)-methanesulfonic acid N-(tert-butoxycarbonyl)-2-[2'-amino-2'-(4"-isopropyl-5"-oxo-tetrahydrofuran-2"-yl)-ethyl]-3-methylbutyl ester

[(1S,3S)-3-bromomethyl-1-((2S,4S)-4-isopropyl-5-oxo-furanidin-2-yl)-4-methylpentyl]carbamic acid tert-butyl ester

[(1S,3S)-3-bromomethyl-1-((2S,4S)-4-isopropyl-5-oxo-furanidin-2-yl)-4-methyl-pentyl]-carbamic acid benzyl ester

tert-butyl (3S,5S)-3-isopropyl-5-((2R,4S)-4-isopropyl-5-oxotetrahydrofuran-2-yl)-2-(4-methoxy-3-(3-methoxypropoxy)phenyl)pyrrolidine-1-carboxylate