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Under IUPAC nomenclature, a molecule named N-[1-[4-(1-aminocyclobutanecarbonyl)-6-oxo-3,3a,5,6a-tetrahydro-2H-pyrrolo[3,2-b]pyrrol-1-yl]-4-methyl-1-oxopentan-2-yl]-4-pyrrolidin-1-ylbenzamide is given. What is its corresponding molecular formula?
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C28H39N5O4
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