You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name methyl 3-[3-[(3aR,7aS)-1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl]propanoylamino]-4-methylbenzoate into its molecular formula.
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C20H22N2O5
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