You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[2-[4-aminobutyl-[2-[[2-[4-aminobutyl(methyl)amino]acetyl]-benzylamino]acetyl]amino]acetyl]-benzylamino]acetamide into its molecular formula.
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C31H47N7O4
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