(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl (4R,4aS,6aR,9S,11bS)-4,11b-dimethyl-8-methylene-9-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetradecahydro-6a,9-methanocyclohepta[a]naphthalene-4-carboxylate