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-(3-aminobutyl)-3-[[3-chloro-5-(trifluoromethyl)pyridin-2-yl]amino]propanamide;dihydrochloride into molecular formula.
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C13H20Cl3F3N4O
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