You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-cyclopropyl-N-[(1R)-1-[1-(2-methoxyphenyl)pyrazol-4-yl]ethyl]-6-oxo-1H-pyrimidine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
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C20H21N5O3
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