You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named [5-amino-4-[(5-fluoro-4-methylpyridin-2-yl)amino]-3,6-dihydro-2H-pyridin-1-yl]-[3-chloro-2-(trifluoromethyl)pyridin-4-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C18H16ClF4N5O
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