{(1S,2R)-3-[(4-Amino-benzenesulfonyl)-isobutyl-amino]-1-benzyl-2-hydroxy-propyl}-carbamic acid (3R,3aS,6aR)-(hexahydro-furo[2,3-b]furan-3-yl) ester
(3R,3aS,6aR)-tetrahydro-2H-furo[2,3-b]furan-3-yl (2S,3R)-4-(4-amino-N-isobutylphenylsulfonamido)-3-hydroxy-1-phenylbutan-2-ylcarbamate