(3aS,4S,6aR)-4-methoxy-tetrahydro-furo[3.4-b]furan-2(3H)-one
(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yl-(4-nitrophenyl)carbonic acid
(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-ol
1-[[[(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yloxy]carbonyl]oxy]pyrrolidine-2,5-dione