You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(8S)-7-(3,5-dimethoxyphenyl)-1-methyl-3,7-diazatricyclo[3.3.1.02,8]nonan-3-yl]-(1-oxo-1,4-thiazinan-4-yl)methanone into molecular formula.
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C21H29N3O4S
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