You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[[3-[(4-chlorophenyl)methyl]-1,2,4-thiadiazol-5-yl]-propan-2-ylamino]-N-[(2R)-3-methylbutan-2-yl]propanamide by IUPAC nomenclature, provide its molecular formula.
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C20H29ClN4OS
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