You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-cyclopropyl-N-[4-(furan-2-yl)-5-(4-methylquinazolin-6-yl)pyrimidin-2-yl]formamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H17N5O2
assistant