[(1s,4ar,5r,7s,7as)-7-hydroxy-7-methyl-1-[(2s,3r,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4a,5,6,7a-tetrahydro-1h-cyclopenta[c]pyran-5-yl] (2e,6e)-8-hydroxy-2,6-dimethylocta-2,6-dienoate