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 (3S,4R)-1-[[2-(2-fluorophenyl)-1,3-thiazol-4-yl]methyl]-4-phenylpyrrolidin-3-amine;dihydrochloride into molecular formula.
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C20H22Cl2FN3S
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