You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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1-[2-[[2-[(2,5-diamino-5-oxopentanoyl)amino]-3-methylbutanoyl]amino]-3-methylpentanoyl]pyrrolidine-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C21H37N5O6
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