You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-(1-methylsulfonyl-2,3-dihydroindol-5-yl)-2-(2,5,6-trimethylthieno[2,3-d]pyrimidin-4-yl)sulfanylethanone .
user
C20H21N3O3S3
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