You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,4R,5R,6R,8R,10S,11R,12S,13R,16R,18S,21R)-8-[(1R)-1-(azetidine-1-carbonyloxy)-2-methylpropyl]-11-hydroxy-4,6,12,17,17-pentamethyl-9-oxahexacyclo[11.9.0.01,21.04,12.05,10.016,21]docosan-18-yl] 3-(ethylamino)azetidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C40H65N3O6
assistant