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 2-[[4-amino-5-(furan-2-yl)-1,2,4-triazol-3-yl]sulfanyl]-N-(2-propan-2-ylphenyl)propanamide into molecular formula.
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C18H21N5O2S
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