You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R,3S)-1-N-[(4-fluorophenyl)methyl]-3-N-(6-methylpyridin-2-yl)cyclopentane-1,3-diamine;hydrochloride into its molecular formula.
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C18H23ClFN3
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