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 tert-butyl N-[3-[[[N-ethyl-N'-[3-(ethylamino)-2,2-dimethyl-3-oxopropyl]carbamimidoyl]amino]methyl]pentan-3-yl]carbamate is given. What is its corresponding molecular formula?
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C21H43N5O3
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