Toluene-4-sulfonic acid (2S,3S)-3-[1,3]dioxolan-2-yl-5-oxo-tetrahydro-furan-2-ylmethyl ester
(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
darunavir
(3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-yl 4-nitrophenyl carbonate