You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-1-(3-methyl-2-oxobutyl)pyrimidine-2,4-dione;3-methyl-1-(4-methylphenyl)butan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H30N2O4
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