You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (7aS,8R,12'S)-4-methylspiro[7aH-thieno[2,3-f][2]benzofuran-8,3'-pentacyclo[7.3.1.14,12.02,7.06,11]tetradecane]-5,7-dione into molecular formula.
user
C24H24O3S
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