(2R,3S,4aR,5aS,6S,6aR,8S,9R,10aS,11aR,12aS)-3,9-bis(benzyloxy)-8-((S)-4-(benzyloxy)butan-2-yl)-2-((benzyloxy)methyl)-6a,12a-dimethyltetradecahydropyrano[3,2-b]pyrano[2',3':5,6]pyrano[2,3-e]pyran-6-ol