You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule N-[[3-(difluoromethoxy)phenyl]methyl]-2-[(5,6-dimethyl-4-oxo-3H-thieno[2,3-d]pyrimidin-2-yl)methylsulfanyl]propanamide ?
user
C20H21F2N3O3S2
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