You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (11R,17S)-17-phenylsulfanyl-18-oxatetracyclo[8.8.0.02,7.011,17]octadeca-1(10),2,4,6-tetraene-8,9-dione into molecular formula.
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C23H20O3S
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