You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 5-(2,3-dihydroxy-4-methoxy-5-propan-2-ylbenzoyl)-2-phenyl-1H-pyrimidin-6-one is given. What is its corresponding molecular formula?
user
C21H20N2O5
assistant