You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(4-methoxyphenyl)-2-pyrrolidin-1-ylethyl]amino]-1-(4-piperidin-1-ylsulfonylphenyl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H35N3O4S
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