3H-Cyclotridec(d)oxireno(f)isoindole-8,11,12(13H)-trione,7-(acetyloxy)-4,7,14,14a,15,15a,16a,16b-octahydro-4,6,15,15a-tetramethyl-14-(phenylmethyl)-, (1E,4S,5E,7R,9E,11aR,14S,14aR,15S,15aR,16aS,16bR)- 79648-72-9