2-Propanone,1-[(5bR,6S,12bS,14R)-6-(acetyloxy)-5b,6,7,12b,13,14-hexahydro-5b,13-dimethyl-1,3-dioxolo[4,5-i][1,3]dioxolo[4,5]benzo[1,2-c]phenanthridin-14-yl]-