You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[3-methoxy-3-[1-(3-methoxy-4,5-dimethylheptanoyl)pyrrolidin-2-yl]-2-methylpropanoyl]amino]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H38N2O6
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