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 acetaldehyde;5-[[5-(6-methoxypyrimidin-4-yl)oxy-2-methylpiperidin-1-yl]methyl]-N-methyl-1,3-thiazol-2-amine into molecular formula.
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C18H27N5O3S
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