You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[4-[4-[3-(5-chloro-1-methylpyrrol-2-yl)-3-oxopropyl]imidazol-1-yl]phenyl]pyridin-2-one into its molecular formula.
user
C22H19ClN4O2
assistant