You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2S,3R,4S)-N-butyl-1-[3-(dimethylamino)benzoyl]-3,4-dihydroxypyrrolidine-2-carboxamide is given. What is its corresponding molecular formula?
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C18H27N3O4
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