(S)-1-((3aR,5R,6aS)-2,2-dimethyl-6-oxotetrahydrofuro[2,3-d][1,3]dioxol-5-yl)-2-methoxy-2-oxoethyl benzoate

methyl (Z)-5-O-benzoyl-3-deoxy-3-C[(ethoxycarbonyl)methylene]-1,2-O-isopropylidene-α-D-penturonate

(4S,5S,7R/7S,7aR)-4,7-dihydroxy-5-methoxycarbonyl-4,5,7,7a-tetrahydro-2H-furo[2,3-c]pyran-2-one

5-methoxycarbonyl-2H-furo[2,3-c]pyran-2-one

3-formyl-5-methoxycarbonyl-2H-furo[2,3-c]pyran-2-one