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 but-3-enyl-[[1-[2-[2-[but-3-enyl-di(propan-2-yl)silyl]oxy-2,3,3a,7a-tetrahydro-1H-inden-1-yl]ethyl]-2,3,3a,7a-tetrahydro-1H-inden-2-yl]oxy]-di(propan-2-yl)silane is given. What is its corresponding molecular formula?
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C40H66O2Si2
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