You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,3-dimethylphenyl)-3-(4-fluorophenyl)-4-(4-methylpiperazin-1-yl)pyrrole-2,5-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H24FN3O2
assistant