(3R,3aS,6aR)-hexahydro[2,3-b]furan-3-yl N-((1S,2R)-1-benzyl-3-[6-amino-2,2-dimethylhexyl][(3,4-methylenedioxyphenyl)sulfonyl]amino-2-hydroxypropyl)carbamate

(3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl N-(1S,2R)-3-[(1,3-benzodioxol-5-ylsulfonyl)(5-cyano-2,2-dimethylpentyl)amino]-1-benzyl-2-hydroxypropylcarbamate

{(1S,2R)-3-[[(2R,3S)-3-Amino-2-hydroxy-4-(4-hydroxy-phenyl)-butyl]-(2-trimethylsilanyl-ethoxycarbonyl)-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid tert-butyl ester

{(1S,2R)-3-[((2R,3S)-3-Amino-2-hydroxy-5-phenyl-pentyl)-(2-trimethylsilanyl-ethoxycarbonyl)-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid tert-butyl ester

{(1S,2R)-1-(4-Benzyloxy-benzyl)-3-[((2R,3S)-3-tert-butoxycarbonylamino-2-hydroxy-4-phenyl-butyl)-(2-trimethylsilanyl-ethoxycarbonyl)-amino]-2-hydroxy-propyl}-carbamic acid benzyl ester