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 (4S)-N-(2,3-dichlorophenyl)-4-(2-methylpropyl)-N-pentan-3-yl-4,5-dihydro-1,3-thiazol-2-amine into molecular formula.
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C18H26Cl2N2S
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