Trifluoro-methanesulfonic acid (3aR,3bS,6R,6aS,7aR)-2,2-dimethyl-5-oxo-hexahydro-furo[2',3':4,5]furo[2,3-d][1,3]dioxol-6-yl ester

(2R,4R,4aS,7R,7aR)-4-(Bis-ethylsulfanyl-methyl)-7-hydroxy-2-(4-methoxy-phenyl)-tetrahydro-furo[3,2-d][1,3]dioxin-6-one

(R)-2-[(2R,4S,5S,6R)-6-(Bis-ethylsulfanyl-methyl)-5-hydroxy-2-(4-methoxy-phenyl)-[1,3]dioxan-4-yl]-2-hydroxy-N-methyl-acetamide

(R)-2-[(2R,4S,5S,6R)-6-(Bis-ethylsulfanyl-methyl)-5-hydroxy-2-(4-methoxy-phenyl)-[1,3]dioxan-4-yl]-2-(tert-butyl-diphenyl-silanyloxy)-N-methyl-acetamide