You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(5-chloro-2-methoxyanilino)-2-oxoethyl] 4-(2,5-dimethylpyrrol-1-yl)benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21ClN2O4
assistant