You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-amino-2-[[2-[[2-[(2-amino-3-hydroxybutanoyl)amino]-3-methylbutanoyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-5-oxopentanoic acid by IUPAC nomenclature, provide its molecular formula.
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C20H33N7O7
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