You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-chloro-N-[2-[4-(5-chloro-2-methylphenyl)piperazin-1-yl]-2-oxoethyl]-N-[(2-methylphenyl)methyl]benzenesulfonamide into molecular formula.
user
C27H29Cl2N3O3S
assistant