Etoposide EP Impurity A

Chemical Name: (5R,5aR,8aR,9S)-5-[4-[[(benzyloxy)carbonyl]oxy]-3,5-dimethoxyphenyl]-9-[[4,6-O-[(1R)-ethane-1,1-diyl]-b-D-glucopyranosyl]oxy]-5,8,8a,9-tetrahydro[2]benzofuro[5,6-f][1,3]benzodioxol-6(5aH)-one (4’-carbobenzoyloxyethylidene-lignan P)