benzyl (4-((5R,5aR,8aR,9S)-9-((9-(4-(((benzyloxy)carbonyl)oxy)-3,5-dimethoxyphenyl)-6-oxo-5,5a,6,8,8a,9-hexahydrofuro[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl)oxy)-6-oxo-5,5a,6,8,8a,9-hexahydrofuro[3',4':6,7]naphtho[2,3-d][1,3]dioxol-5-yl)-2,6-dimethoxyphenyl) carbonate,Etoposide Impurity