You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (3R)-N-(4-acetamidophenyl)-1-[(2,4-dichlorophenyl)methylsulfonyl]piperidine-3-carboxamide ?
user
C21H23Cl2N3O4S
assistant