You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[(4-chloro-3-methylphenoxy)methyl]-1-(4-chlorophenyl)sulfonylpiperidin-3-yl]-1-piperidin-1-ylethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H32Cl2N2O4S
assistant