3-ethyl 1,2-dimethyl (1S,2S,3R,4R,5S)-4,5-(diethylmethylenedioxy)-1,2-(dimethylmethylenedioxy)-3,6-dihydroxyhexane-1,2,3-tricarboxylate

3-ethyl 1,2-dimethyl (1S,2S,3R,4R,5S)-4,5-(diethylmethylenedioxy)-1,2-(dimethylmethylenedioxy)-6-hydroxy-3-(trimethylsilyloxy)hexane-1,2,3-tricarboxylate

3-ethyl 1,2-dimethyl (1S,2S,3R,4R,5R)-4,5-(diethylmethylenedioxy)-1,2-(dimethylmethylenedioxy)-5-formyl-3-(trimethylsilyloxy)pentane-1,2,3-tricarboxylate

3-ethyl 1,2-dimethyl (1S,2S,3R,4R,5R,10R,11R)-10-benzyloxy-4,5-(diethylmethylenedioxy)-1,2-(dimethylmethylenedioxy)-11-methyl-6-oxo-12-phenyl-3-(trimethylsilyloxy)dodecane-1,2,3-tricarboxylate