[(1S,2R)-1-Benzyl-3-(4-cyano-2,2-dimethyl-butylamino)-2-hydroxy-propyl]-carbamic acid (3R,3aS,6aR)hexahydro-furo[2,3-b]furan-3-yl ester

(3R,3aS,6aR)hexahydrofuro[2,3-b]furan-3-yl N-(1S,2R)-3-[(4-amino-2,2-dimethylbutyl)(1,3-benzodioxol-5-ylsulfonyl)amino]-1-benzyl -2-hydroxypropylcarbamate

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

{(1S,2R)-3-[(Benzo[1,3]dioxole-5-sulfonyl)-(4-cyano-2,2-dimethyl-butyl)-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid (3R,3aS,6aR)hexahydro-furo[2,3-b]furan-3-yl ester

{(1S,2R)-3-[(5-Amino-2,2-dimethyl-pentyl)-(benzo[1,3]dioxole-5-sulfonyl)-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid (3R,3aS,6aR)-(hexahydro-furo[2,3-b]furan-3-yl) ester