((1S,2S,4S)-4-Amino-1-benzyl-2-hydroxy-5-phenyl-pentyl)-carbamic acid (3R,3aS,6aR)-(hexahydro-furo[2,3-b]furan-3-yl) ester

{(1S,3S,4S)-1-Benzyl-4-[(3R,3aS,6aR)-(hexahydro-furo[2,3-b]furan-3-yl)oxycarbonylamino]-3-hydroxy-5-phenyl-pentyl}-carbamic acid tert-butyl ester

(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yl 4-nitrophenyl carbonate