You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,3-dichlorophenyl)ethyl]-1-(2,3-dihydro-1H-inden-5-ylsulfonyl)piperidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26Cl2N2O3S
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