You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(4-methyl-6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)pyrimidin-2-yl]hydrazine is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H15N5S
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