You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-(4-tert-butylphenyl)-3-sulfanylidene-1,4-diazaspiro[4.5]dec-1-en-4-yl]-(4-methoxyphenyl)methanone by IUPAC nomenclature, provide its molecular formula.
user
C26H30N2O2S
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