You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(6-ethylthieno[2,3-d]pyrimidin-4-yl)sulfanyl-1-(1,3,3-trimethyl-6-azabicyclo[3.2.1]octan-6-yl)ethanone .
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C20H27N3OS2
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