You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[2-hydroxy-2-methyl-1-[4-(trifluoromethoxy)phenyl]propyl]-7-methoxy-2-oxo-1,3-dihydropyrido[2,3-b]pyrazine-4-carboxamide into molecular formula.
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C20H21F3N4O5
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