(1R,2R,4aS,11bR)-1-Benzyloxy-2-hydroxy-7-methoxy-5-(4-methoxy-benzyl)-1,4a,5,11b-tetrahydro-2H-[1,3]dioxolo[4,5-j]phenanthridin-6-one

(6aS,7aR,8aR,9R,9aR)-9-(benzyloxy)-4-methoxy-6-(4-methoxybenzyl)-6a,7,7a,8a,9,9a-hexahydro-[1,3]dioxolo[4,5-j]oxireno[2,3-b]phenanthridin-5(6H)-one

(6aS,7aR,8aR,9S,9aR)-9-((tert-butyldimethylsilyl)oxy)-4-methoxy-6-(4-methoxybenzyl)-6a,7,7a,8a,9,9a-hexahydro-[1,3]dioxolo[4,5-j]oxireno[2,3-b]phenanthridin-5(6H)-one