You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[(2-methylpropan-2-yl)oxycarbonylamino]-2-prop-2-enoxycarbonylpyrrol-1-yl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H20N2O6
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