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 (3aR,5S,6S,7R,7aR)-2-[ethyl(methyl)amino]-5-[(1R)-1-methoxyethyl]-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d][1,3]thiazole-6,7-diol into molecular formula.
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C12H22N2O4S
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