chloro-acetic acid 6-[9-(4-benzyloxycarbonyloxy-3,5-dimethoxy-phenyl)-6-oxo-5,5a,6,8,8a,9-hexahydro-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yloxy]-8-chloroacetoxy-2-methyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl ester

4,4'-bis(tert-butyldimethylsilyl)-4'-O-demethylepipodophyllol

11-oxo-13-deoxo-4'-demethylepipodophyllotoxin

11-oxo-13-deoxo-4'-benzyloxycarbonyl-4'-demethylepipodophyllotoxin

(5S,5aS,8aR,9R)-5-(tert-Butyl-dimethyl-silanyloxy)-9-[4-(tert-butyl-dimethyl-silanyloxy)-3,5-dimethoxy-phenyl]-5,8,8a,9-tetrahydro-5aH-furo[3',4':6,7]naphtho[2,3-d][1,3]dioxol-6-one