You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-amino-5,6-dimethyl-2-[4-(4-quinolin-2-ylpiperazin-1-yl)butyl]thieno[2,3-d]pyrimidin-4-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H30N6OS
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