methyl (1R,2S)-3-oxo-2-(5-2',3',4',6'-tetrakis-O-dichloroacetyl-β-D-glucopyranosyloxy-cis-2-pentenyl)-1-cyclopentaneacetate

(1R,7Z,10S,11R)-11-hydroxy-4-oxabicyclo[8.3.0]tridec-7-en-3-one