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 2-[ethyl-[(2R)-1-methoxy-3-phenylpropan-2-yl]amino]-N-(3-sulfamoylphenyl)acetamide is given. What is its corresponding molecular formula?
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C20H27N3O4S
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