You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[5-(3,4-dimethylphenyl)thieno[2,3-d]pyrimidin-4-yl]sulfanyl-N-(5-ethyl-1,3,4-thiadiazol-2-yl)butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H23N5OS3
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