73793-68-7 Oxireno(4,4a)-2-benzopyrano(6,5-g)(2)benzoxepin-3,5,9(3aH,4bH,6H)-trione,1-(2,5-dihydro-5-hydroxy-2-oxo-3-furanyl)-1,6a,7,11a,11b,12,13,13a-octahydro-4b,7,7,11a,13a-pentamethyl-, (1R,3aS,4aR,4bR,6aR,11aR,11bR,13aS)-