You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-methyl-4-(4-methyl-5-oxo-4-propan-2-yl-1H-imidazol-2-yl)pyrimidine-5-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H20N4O3
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