You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-methyl-N-[(2S)-3-methyl-1-oxo-1-[4-[4-(trifluoromethyl)phenoxy]piperidin-1-yl]butan-2-yl]pyrido[3,4-b]pyrazine-3-carboxamide into molecular formula.
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C26H28F3N5O3
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