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 4-N-[diethoxyphosphoryl-(4-methoxyphenyl)methyl]-1-N,1-N-diethylpentane-1,4-diamine is given. What is its corresponding molecular formula?
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C21H39N2O4P
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