You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[(4-oxo-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-2-yl)methylsulfanyl]-N-[2-(trifluoromethoxy)phenyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20F3N3O3S2
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