(1aR,2R,3aS,11aS,11bS)-2-hydroxy-5-methoxy-1a,9-dimethyl-2,3,3a,8,9,10,11,11b-octahydro-1aH-oxireno[2”,3”:3′,4′]benzo[1′,2′:2,3]benzofuro[4,3-cd]azepine9-oxide