You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S,4S,5S,8Z,10E,12R,13R,14E,16Z,18E)-2-[(R)-acetyloxy-[(2R,3R,4S,5S,6R)-4-acetyloxy-6-[(2R)-2-acetyloxy-3-methoxypropyl]-2-hydroxy-3,5-dimethyloxan-2-yl]methyl]-12-[(2R,3S,4R,5S,6S)-3,4-diacetyloxy-5-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-9,13,15,17,19-pentamethyl-20-oxo-1-oxacycloicosa-8,10,14,16,18-pentaen-5-yl] acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C56H84O21
assistant