You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-1-[(2,4-dichlorophenyl)methylsulfonyl]-N-(1,2-dihydroacenaphthylen-5-yl)piperidine-3-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H24Cl2N2O3S
assistant