(3R,3aS,6aR)-tetrahydro-2H-furo[2,3-b]furan-3-yl (2S,3R)-4-(4-amino-N-neopentylphenylsulfonamido)-3-hydroxy-1-phenylbutan-2-ylcarbamate
(3-((4-aminobenzenesulfonyl)isobutylamino)-1-benzyl-2-hydroxypropyl)carbamic acid hexahydrofuro(2,3-b)furan-3-yl ester