You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(4-methylphenyl)sulfonylpiperazin-1-yl]-4-[4-(pyridin-4-ylmethyl)piperazin-1-yl]butane-1,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H33N5O4S
assistant