You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4,5-diacetyloxy-6-[[(2R)-5-acetyloxy-2-(4-acetyloxyphenyl)-4-oxo-2,3-dihydrochromen-7-yl]oxy]-2-[4-(4-acetyloxyphenyl)-2-oxobut-3-enyl]oxan-3-yl] acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C42H40O17
assistant