You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
benzyl (3aS)-5-oxo-6-propan-2-yl-2,3,3a,4-tetrahydropyrrolo[3,2-b]pyrrole-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H20N2O3
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