You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 4-oxo-2-[(3-phenyl-1H-pyrazole-5-carbonyl)oxymethyl]-3H-quinazoline-7-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H16N4O5
assistant