You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-cyclopropyl-N-[4-(2,5-dimethylthiophen-3-yl)-1,3-thiazol-2-yl]-4,5-dimethylthieno[2,3-d]pyrimidine-6-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20N4OS3
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