You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-(2-hydroxyethyl)piperazin-1-yl]-4-(4-methoxyphenyl)-1-phenylpyrrole-2,5-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H25N3O4
assistant