You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3R,4S,5R,6R)-6-[[(2R,3R,4S,5R,6R)-6-[[(3S,8S,9S,10R,13S,14S,16R,17S)-17-acetyl-16-(2,5-dimethoxyphenyl)-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]-3,4,5-tribenzoyloxyoxan-2-yl]methoxy]-3,4,5-tribenzoyloxyoxan-2-yl]methyl benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C90H88O21
assistant