You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-[[[[dimethoxy(3-oxidopropyl)silyl]oxy-methoxy-(3-oxidopropyl)silyl]oxy-methoxy-(3-oxidopropyl)silyl]oxy-dimethoxysilyl]propan-1-olate by IUPAC nomenclature, provide its molecular formula.
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C18H42O13Si4-4
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