You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 19-[4,5-bis(methylsulfanyl)-1,3-dithiol-2-ylidene]-6,9,12-trioxa-3,15,18,20-tetrathiabicyclo[15.3.0]icos-1(17)-ene is given. What is its corresponding molecular formula?
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C18H26O3S8
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