(9H-fluoren-9-yl)methyl (3aR,3bR,6S,7R,7aR,8aR)-6-hydroxy-2,2-dimethylhexahydro-7,3b-(epiminoethano)[1,3]dioxolo[4',5':4,5]furo[3,2-b]pyran-9-carboxylate

(9H-fluoren-9-yl)methyl (3aR,3bR,6R,7R,7aR,8aR)-6-hydroxy-2,2-dimethylhexahydro-7,3b-(epiminoethano)[1,3]dioxolo[4',5':4,5]furo[3,2-b]pyran-9-carboxylate

(3aR,3bR,6R,7R,7aR,8aR)-2,2-dimethylhexahydro-7,3b-(epiminoethano)[1,3]dioxolo[4',5':4,5]furo[3,2-b]pyran-6-ol

(3aR,3bR,6S,7R,7aR,8aR)-9-(tert-butylsulfonyl)-6-methoxy-2,2-dimethylhexahydro-7,3b-(epiminoethano)[1,3]dioxolo[4',5':4,5]furo[3,2-b]pyran

2,2,2-trichloroethyl (3aR,3bR,6S,7R,7aR,8aR)-6-hydroxy-2,2-dimethylhexahydro-7,3b-(epiminoethano)[1,3]dioxolo[4',5':4,5]furo[3,2-b]pyran-9-carboxylate