You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4,4-dimethyl-7-(3-methyloctan-2-yl)-1,2-dihydrothieno[2,3-c]chromen-9-yl] 4-piperidin-1-ylbutanoate by IUPAC nomenclature, provide its molecular formula.
user
C31H47NO3S
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