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 3-[5-[hydroxy-(5-thiophen-2-yl-2,3-dihydrothiophen-2-yl)methyl]thiophen-2-yl]-1-thiophen-2-ylpropan-1-one is given. What is its corresponding molecular formula?
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C20H18O2S4
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