You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 3-(3-pyridin-4-yl-1,2,4-oxadiazol-5-yl)-N-(2-pyrrolidin-1-yl-1,3-benzothiazol-6-yl)propanamide into molecular formula.
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C21H20N6O2S
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