You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(Z)-[4-methoxycarbonyl-5-methyl-2-oxo-1-(pyridin-3-ylmethyl)pyrrol-3-ylidene]methyl]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H17N2O5-
assistant