You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-cyclopropyl-4-[[N'-[[2-(difluoromethoxy)-5-methoxyphenyl]methyl]-N-ethylcarbamimidoyl]amino]butanamide is given. What is its corresponding molecular formula?
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C19H28F2N4O3
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