(1S,3R,4R,5S,7RS)-3,4-(isopropylidenedioxy)-1-<(1R)-1,2-(isopropylidenedioxy)ethyl>-2-oxaspiro<4.4>nonan-7-ol

(3S)-3-deoxy-1,2:5,6-di-O-isopropylidene-α-D-ribo-hexofuranose-3-spiro-(3-oxocyclopentane)

(3R)-3-deoxy-1,2:5,6-di-O-isopropylidene-α-D-ribo-hexofuranose-3-spiro[3-(hydroxyethylidene)cyclopentane]

ethyl 2-((1S,3a'R,5'S,6a'R)-5'-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-2',2'-dimethyldihydro-5'H-spiro[cyclopentane-1,6'-furo[2,3-d][1,3]dioxol]-3-ylidene)acetate