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-(4-methoxyphenyl)-N-[6-(propylamino)-4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl]propanamide is given. What is its corresponding molecular formula?
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C20H27N3O2S
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