(2S,4aR,4bS,6aS,6bS,9aS,10aS,10bS)-8-(4-Hydroxy-3-methyl-butyl)-4a,6a,7-trimethyl-2,3,4,4a,4b,5,6,6a,6b,9a,10,10a,10b,11-tetradecahydro-1H-9-oxa-pentaleno[2,1-a]phenanthren-2-ol