You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3S,3aR,4S,6aS)-1-(2-ethylbutyl)-4-(2-oxo-2-pyrrolidin-1-ylethyl)-2,3,3a,4,6,6a-hexahydrofuro[3,4-b]pyrrol-3-yl]-N-propan-2-ylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H41N3O3
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