You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [4-[2-[4-[(5-methoxy-1,1,1',1'-tetramethyl-3,3'-spirobi[2H-indene]-5'-yl)oxycarbonyloxy]phenyl]propan-2-yl]phenyl] acetate into molecular formula.
user
C40H42O6
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