You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[[2-(1-benzofuran-2-yl)-4-oxoquinazolin-3-yl]iminomethyl]-2,6-dimethoxyphenoxy]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H21N3O7
assistant