You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (4-nitrophenyl)methyl N-[N-[(4-nitrophenyl)methoxycarbonyl]-N'-[2-oxo-2-[[(3S)-pyrrolidin-3-yl]amino]ethyl]carbamimidoyl]carbamate into its molecular formula.
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C23H25N7O9
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