You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(6-phenyl-2-pyridin-2-ylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl]-N-propylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H28N6OS
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