You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[(7S)-8'-chloro-4-cyclooctyl-2-[(1-methylpyrrolidin-2-yl)methoxy]spiro[1,2,3,4a,5,6,8,8a-octahydroquinazoline-7,3'-1,4-dihydroisochromene]-4-yl]-1-prop-2-enoylpiperazin-2-yl]acetonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C39H57ClN6O3
assistant