(1R,2R,3S,4S,4aR,11bR)-1-benzyloxy-5-(4-methoxy-benzyl)-2,3,4-trihydroxy-7-methoxy-1,3,4,4a,5,11b-hexahydro-2H-[1,3]dioxolo[4,5-j]phenanthridin-6-one

4-(1-Ethoxy-ethoxy)-benzo[1,3]dioxole-5-carboxylic acid [(1R,5S,6R)-5-(tert-butyl-dimethyl-silanyloxy)-7-oxa-bicyclo[4.1.0]hept-3-en-3-yl]-amide

(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

(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

methyl 2-hydroxy-7-oxabicyclo[4.1.0]hept-3-ene-4-carboxylate

tert-Butyl-((1R,2S,6R)-4-isocyanato-7-oxa-bicyclo[4.1.0]hept-3-en-2-yloxy)-dimethyl-silane

4-(1-Ethoxy-ethoxy)-benzo[1,3]dioxole-5-carboxylic acid [(1R,5S,6R)-5-(tert-butyl-dimethyl-silanyloxy)-7-oxa-bicyclo[4.1.0]hept-3-en-3-yl]-(4-methoxy-benzyl)-amide

(6aS,7aR,8aR,9aR)-4-methoxy-6-(4-methoxybenzyl)-6a,7a,8a,9a-tetrahydro-[1,3]dioxolo[4,5-j]oxireno[2,3-b]phenanthridine-5,9(6H,7H)-dione

(6aS,7aR,8aS,9S,9aR)-9-hydroxy-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