You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[2-[[N'-[2-(3,4-difluorophenyl)propyl]-N-ethylcarbamimidoyl]amino]ethyl]-2-methylpropanamide;hydroiodide into its molecular formula.
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C18H29F2IN4O
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