You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[5-(6-benzoyl-5-hydroxy-2-oxo-3,4-dihydrochromen-4-yl)furan-2-yl]benzoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H18O7
assistant