You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-ethyl-2-[[(6S)-6-methyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl]amino]ethanesulfonamide into molecular formula.
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C12H20N2O2S3
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