4-[(1R,2S,3aS,3bR,5aR,7S,9aS,9bS,11aS,11R)-7-{[(2R,4S,5S,6R)-5-{[(2S,4S,5S,6R)-5-{[(2S,4S,5S,6R)-4,5-dihydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-4-hydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-4-hydroxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-2,3a,11-trihydroxy-9a,11a-dimethylhexadecahydro-1H-cyclopenta[1,2-a]phenanthren-1-yl]-2,5-dihydrofuran-2-one