Etoposide Imp. O (EP):(5R,5aR,8aR,9S)-9-[[4,6-O-[(R)-ethylidene]-ß-d-glucopyranosyl]oxy]-5-[4-[[(5R,5aR,8aR,9S)-5-(4-hydroxy-3,5-dimethoxyphenyl)-6-oxo-5,5a,6,8,8a,9-hexahydroisobenzofuro[5,6-f][1,3]benzodioxol-9-yl]oxy]3,5-dimethoxyphenyl]-5,8,8a,9-.