You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[1-[2-[(2-amino-3-methylbutanoyl)amino]-3-(1H-imidazol-5-yl)propanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carboxylic acid into molecular formula.
user
C21H32N6O5
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