You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(2,4-dioxo-1H-pyrido[2,3-d]pyrimidin-3-yl)ethyl]-1H-imidazole-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H12N6O3
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