You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-(1,3-dimethyl-2,6-dioxo-7H-purin-8-yl)butanoic acid;7-methoxy-4-methylchromen-2-one into molecular formula.
user
C22H24N4O7
assistant