You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)methylsulfanyl]-N-(2-pyridin-2-ylsulfanylpyridin-4-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21N5O2S3
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