You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(3-chloro-4-methoxyphenyl)methylamino]-8-[4-(2-hydroxyethyl)piperazin-1-yl]phthalazine-6-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H25ClN6O2
assistant