You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5,6-dimethyl-4-[3-(4-methylpyrazol-1-yl)azetidin-1-yl]thieno[2,3-d]pyrimidine by IUPAC nomenclature, provide its molecular formula.
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C15H17N5S
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