You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [(3R,4S)-4-methoxy-3-[(4-methoxyphenyl)methyl]piperidin-1-yl]-(1,3-thiazol-4-yl)methanone is given. What is its corresponding molecular formula?
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C18H22N2O3S
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